Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
You want a single huge block of ice that takes hours to melt, not tiny cubes that disappear in minutes. The key difference between a good container and a frustrating one depends on silicone thickness, block weight, and how easily the frozen brick pops out.
I’m Mohammad Maruf — the founder and writer behind WellFizz. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Whether you are chilling a cold plunge tub, keeping a fishing cooler cold all day, or making giant ice for a party, finding the right container to make ice blocks saves you money on bagged ice and gives you slow-melting blocks that actually do the job.
Quick Picks
- MT.BAY Ice Block Form 12 Lb — Best Overall
- Alaskey Giant Ice Block Mold 12 lbs (3-Pack) — Premium Pick
- DOGITY 2Pack 16LB Silicone Molds — Best Value
- DOGITY 4Pack 32LB Silicone Molds — Top Capacity
- Mouwaii 8Pcs Extra Large Ice Block Mold — Batch Maker
- Haldane 2PC Extra Large Ice Block Molds 6LB — Budget Champion
- Mouwaii 5Pcs Extra Large Ice Block Mold — Good Value 5-Pack
How To Choose The Best Container To Make Ice Blocks
A single 10-lb bag of ice costs a few dollars and melts fast. A reusable silicone mold pays for itself quickly, but not every mold is built the same.
Start with the block weight you actually need
A 6-lb block will cool a medium cooler for several hours, but dropping the temperature of a full ice bath tub from tap water to the mid-50s°F often requires 30–40 lbs of ice total. If you are buying for cold plunge therapy, you want a container that makes at least 8–12 lbs per block, or you buy a multi-pack so you can freeze several at once.
Silicone thickness and reinforced corners prevent collapse
Fill a thin silicone mold with a gallon of water and move it to the freezer — the sides bulge and the bottom bows. Look for a “thickened” or “reinforced” description in the specs. Several manufacturers add extra silicone at the four corners so the final ice block keeps a rectangular shape and the mold does not sag under the water weight.
Ease of release separates a daily-use tool from a hassle
Once the water is fully frozen, you want the block to slide out after a few minutes at room temperature, not require a fight. Flexible food-grade silicone should let you pull the sides open and invert the mold in one motion. Reviewers consistently mention that the best molds let the ice pop out “easily” after a short wait.
Quick Comparison
| Model | Best For | Block Weight | Count | Dimensions (LxWxH) | Amazon |
|---|---|---|---|---|---|
| Haldane 2PC 6LB | Budget pair for coolers | 6 lb | 2 | 10″ x 5.7″ x 3″ | Amazon |
| Mouwaii 5Pcs 9″ | Multi-block batches | — | 5 | 9″ x 5″ x 0.5″ | Amazon |
| Mouwaii 8Pcs 9″ | Massive batch for ice baths | — | 8 | 9″ x 5″ x 0.5″ | Amazon |
| MT.BAY 12 Lb | Single giant block | 12 lb | 1 | 12″ x 8″ x 5″ | Amazon |
| DOGITY 2Pack 16LB | Two 8-lb blocks per freeze | 8 lb each | 2 | — | Amazon |
| DOGITY 4Pack 32LB | Four 8-lb blocks per freeze | 8 lb each | 4 | — | Amazon |
| Alaskey 3-Pack 12 lb | Pro-grade stackable bricks | 12 lb each | 3 | 5″ x 3″ x 9″ | Amazon |
In‑Depth Reviews
1. MT.BAY Ice Block Form 12 Lb
A single massive 12-lb brick that keeps a cooler cold all day without multiple molds.
The MT.BAY form makes the biggest single block on this list — 12 lbs of ice — keeping drinks cold through a long day trip. Its dimensions (12″ x 8″ x 5″) mean it fits most large rotomolded coolers. A metal reinforced rim around the top stops the mold from bowing when you carry it full of water to the freezer, unlike softer silicone molds that lack that support. It is food-grade silicone and dishwasher safe, so cleaning is easy on the top rack.
Compared to the Haldane 2PC which makes two 6-lb blocks, this MT.BAY form gives you double the ice weight in a single brick. The trade-off is that it produces only one block per freeze cycle, so if you need 30–40 lbs for an ice bath, you will need to run several cycles or buy additional units. The manufacturer says freeze time is about 24 hours. One reviewer notes you should leave a half-inch of space at the top to let the water expand without cracking the mold.
Buyers report that after many uses the shape can become “a little distorted,” but most owners say the block pops out easily if you let the mold sit for 5–10 minutes at room temperature before releasing.
The Big Block Advantage
- 12-lb block — the highest single-block weight on this list — keeps cooler contents cold longer than smaller blocks
- Metal reinforced rim prevents the mold from bowing when full of water
- Dishwasher safe for easy cleaning between uses
The One Limitation
- Only one block per freeze — not ideal if you need many pounds quickly for an ice bath
- A few owners mention minor shape distortion after repeated use
Reach for this if: you want the single biggest ice brick possible for a large cooler, camping trip, or deep freezer storage — one fill, one block, all-day cold.
Look elsewhere if: you need to make several blocks at once for a cold plunge tub; you will want a multi-pack instead.
2. Alaskey Giant Ice Block Mold 12 lbs (3-Pack)
Three pro-grade molds that stack in the freezer and make 36 lbs of ice at once.
Each mold in this Alaskey pack produces a 12-lb brick, just like the MT.BAY form, but you get three in one purchase — a total capacity of 36 lbs per freeze cycle. The stackable design is the standout feature: customers note they can pile the molds right on top of each other in the freezer without the blocks fusing, which saves shelf space compared to three separate wide molds. Owners note the “ultra thick” silicone feels sturdy, and the ice bricks melt slowly.
One buyer uses them to keep water cold during vegetable blanching and says the blocks last longer than bagged ice. The main drawback compared to the MT.BAY form is that the Alaskey molds are smaller in footprint (5″ x 3″ x 9″ each) but taller (9″H), which might not fit every freezer shelf. A reviewer flagged the price as higher than other options, though they rated the product itself five stars.
If you are running a regular cold plunge routine or you want to pre-freeze a week’s worth of cooler ice in one go, this 3-pack delivers the most total ice weight per freeze cycle in the list.
Stack-and-Freeze Design
- Three 12-lb molds make 36 lbs total ice per freeze — enough to chill a full ice bath tub
- Stackable shape efficiently uses vertical freezer space
- Silicone feels thick and durable; reviewers point out it should last a while
Consider This
- Taller profile (9″H) may not fit all freezer shelves — measure your clearance first
- Premium price compared to single-mold options
Best suited for: the cold plunge enthusiast or big-family camper who wants to freeze an entire batch of blocks at once without freezer Tetris.
The main trade-off: you pay more upfront, but the per-block cost is in line with mid-range molds once you divide the pack price by three.
3. DOGITY 2Pack 16LB Silicone Molds
Two 8-lb molds that deliver 16 lbs of ice without occupying half your freezer.
The DOGITY 2Pack gives you a balanced pair where each mold makes an 8-lb block. Two blocks together provide 16 lbs total — enough to drop the temperature in a small ice bath tub or keep a large cooler cold through a beach day. The silicone is BPA-free (a type of plastic additive that is avoided for safety) and food-safe. Shoppers say the blocks pop out easily by flipping the mold and squeezing the sides.
Buyers report that the molds can bow if you fill them all the way at once. One owner recommends freezing in layers, adding about an inch of water at a time, to prevent the bottom from bulging under the weight. The finished blocks weigh slightly under 8 lbs according to some user measurements, but still melt slowly. At 10.4 ounces each, the molds are lightweight and easy to handle when full.
Compared to the Haldane 2PC which makes two 6-lb blocks, the DOGITY gives you 4 more total pounds of ice. That makes it a better value per pound of ice produced.
Solid Middle Ground
- Two 8-lb blocks provide 16 lbs total — enough for most coolers and small ice baths
- BPA-free, food-grade silicone is dishwasher safe for simple cleaning
- Soft silicone allows easy release by squeezing and flipping
Freeze Tip Needed
- Bowing reported when filled completely at once — best to freeze in 1-inch layers
- Some users say finished blocks weigh closer to 6 lb rather than the advertised 8 lb
Choose this when: you want a balanced pair of large ice blocks without spending premium money — a great entry point for home ice baths or weekend cooler trips.
skip it if: you need 12-lb monster blocks or you want a single mold that does not require layered freezing.
4. DOGITY 4Pack 32LB Silicone Molds
Four molds that pump out 32 lbs of ice in one freeze — the batch champion for serious cold plunge users.
This is the same DOGITY mold design as the 2Pack above but doubled to four units. If you are buying a container to make ice blocks for regular ice bath therapy, you need about 30–40 lbs of ice to get your tub water from room temperature down to the low 50s°F. This 4Pack hits 32 lbs in a single freeze cycle, saving you from running multiple batches or buying bagged ice to supplement. Each mold still produces an 8-lb block, and the BPA-free silicone construction is identical to the 2Pack version.
Reviewers echo the same layered-freeze advice — pour about an inch of water at a time to prevent bowing. One owner says they have made “over 100 lbs of ice” across multiple uses with no wear or ripping, which speaks to the durability. The same warm-water-release trick works: run warm water around the edge of the mold if the ice sticks, as a few owners mention is occasionally necessary.
At 10.4 ounces per mold, all four together weigh less than a single 2-lb bag of sugar, so carrying them to the freezer full of water is manageable.
Batch-Production Power
- 32 lbs total ice per freeze — enough for a full ice bath without supplementing with bagged ice
- Soft silicone allows easy extraction by flipping and squeezing the mold
- Durable material holds up to repeated use; one owner reported over 100 lbs made without damage
Freezer Space Required
- Four molds take up significant freezer real estate — measure ahead of time
- Layered freezing (1 inch at a time) recommended to prevent bowing
Best for: anyone who uses ice baths multiple times per week and wants to produce a full load of ice in one go without multiple freeze cycles.
The real catch: you need enough freezer space to accommodate four molds simultaneously, and you will want to freeze in layers for the best block shape.
5. Mouwaii 8Pcs Extra Large Ice Block Mold
An eight-mold kit that produces more individual blocks per ounce than any other set here.
With 8 separate molds, this Mouwaii set gives you the highest block count of any product in the lineup. Each mold is the same size at 9″ x 5″ x 0.5″, and the reinforced sides help maintain the shape integrity of the ice so your blocks come out rectangular rather than bulging. Reviewers confirm that “large ice blocks freeze solid, easy to remove, and melt slowly” — the exact same feedback given by buyers of the 5-pack Mouwaii mold below.
At 1.15 kilograms total, this set is heavier than the 5-pack version (which weighs 0.68 kilograms), which makes sense given the extra three molds. One note from reviews: cold plunge users say the 8 blocks alone may not be enough for a full tub. One reviewer says you still “need 15 blocks for significant temp drop.” That means you would either need multiple sets or supplement with bagged ice. Still, for the price, getting 8 molds at once is great value if you are making ice for a big party cooler or multiple small coolers.
The color scheme is skyblue and black, which looks clean in a freezer, and the silicone is dishwasher safe for easy cleaning between uses.
Quantity Over Scale
- 8 molds produce the most individual blocks per freeze cycle — great for multiple coolers or events
- Reinforced sidewalls help prevent bulging and keep block shapes clean
- Dishwasher safe silicone is easy to clean after each use
Ice Bath Reality
- 8 blocks still fall short of the 15 blocks cold plunge users typically need for a meaningful temperature drop
- Each mold is smaller than the 12-lb giants — less ice per individual block
Grab this if: you want a high-quantity set for parties, events, or multiple small coolers and you do not need massive single blocks.
Pass if: you need fewer but heavier bricks for an ice bath — the 12-lb molds or DOGITY 4Pack will serve you better.
6. Haldane 2PC Extra Large Ice Block Molds 6LB
Two 6-lb molds at the lowest entry price for anyone wanting to try block ice at home.
The Haldane set is the most affordable way to start making big ice blocks. Each silicone tray makes a single 6-lb block. As one buyer puts it: “Silicone ice tray makes a single 6-lb block.” The thickened silicone and reinforced four corners prevent the mold from collapsing when you fill it with water, a common problem with ultra-thin budget molds. The manufacturer claims the blocks take 7–9 hours to completely melt at 71.6°F room temperature — so they last a full afternoon in a cooler.
Reviewers love that the ice pops out easily. One owner who uses them for fishing says the blocks last all day in the cooler with store-bought ice on top. Another notes you will need about 8 molds (4 of these 2-packs) to get an ice bath down to the mid-50s°F. The item weight is only 0.51 kilograms for both molds, making them lighter than the Mouwaii 5-pack (0.68 kg).
The main trade-off is the 6-lb block size — smaller than the 8-lb or 12-lb options above. But if you are just getting into cold plunges or want a cheap pair of molds for a weekend cooler, this set is tough to top on price.
Affordable Starter Set
- Two 6-lb molds at the lowest price in the list — easy to try block ice without a big investment
- Thickened silicone with reinforced corners resists collapse and makes ice pop out easily
- Blocks melt slowly (7–9 hours at room temp) per the manufacturer
Small Blocks
- 6 lb per block is the smallest among the dedicated block molds here
- You will likely need multiple packs (4 packs = 8 molds) for a cold plunge to reach target temperature
Smart buy when: you are on a tight budget or you want a pair of molds to test whether block ice works for your cooler routine before committing to pricier options.
Reconsider if: you already know you need 30+ lbs of ice per session — buying four of these to get 8 molds costs more than one larger multi-pack.
7. Mouwaii 5Pcs Extra Large Ice Block Mold
Five gray silicone molds that work well but leave you wanting a few more for serious ice bath use.
At 9″ x 5″ x 0.5″ each, these molds are identical in size to the 8-pack version, and the reinforced sides help the ice maintain a proper rectangular shape. Reviewers repeat the same phrase: “Large ice blocks freeze solid, easy to remove, melt slowly.” One buyer bought these for his grandson to make ice bricks for a snow fort and noted the process took a long time — “may need to buy another set next year.”
The critical feedback from cold plunge users is that 5 blocks is not enough. One buyer says you need “at least 3 sets” (15 blocks total) for a meaningful temperature drop in a full ice bath. That is a pattern consistent across all the Mouwaii products. Compared to the 8-pack version, this 5-pack saves a few dollars upfront but costs more per mold if you end up buying multiple sets to reach 15 blocks.
At 0.68 kilograms, the 5-pack is noticeably lighter than the 8-pack (1.15 kg), which means carrying it to the freezer is easier, but you are getting less total silicone for the weight difference.
Decent Middle Option
- 5 molds give you more blocks per freeze than a 2-pack without the full commitment of an 8-pack
- Reinforced sides help maintain block shape during freezing
- Silicone is dishwasher safe and easy to clean
Not Enough for Plunge
- Cold plunge users report needing 15 blocks for full effectiveness, meaning you will buy at least 3 sets
- Per-mold cost is higher than buying the 8-pack if you know you need many blocks
Worth it for: someone who wants a moderate number of extra-large blocks for a large cooler or occasional ice bath and does not want to store a dozen molds.
Not the best pick for: regular cold plunge therapy where you know you will need 15+ blocks per session — the 8-pack or DOGITY 4Pack delivers more usable ice per freeze.
Understanding the Specs
Block Weight (lbs)
This is the total weight of the frozen water each mold holds — typically 6 lb, 8 lb, or 12 lb. A heavier block means more cooling power and slower melting, but it also takes longer to freeze (usually 12–24 hours). For a standard cooler, one 12-lb block can keep food cold all day. For an ice bath, you generally need 30–40 lbs total to drop the water temperature meaningfully. If the product data does not list a block weight, the mold size is your next clue.
Number of Molds Per Pack
Some containers sell as singles, others as 2-packs, 4-packs, 5-packs, or 8-packs. This matters because the total ice you produce per freeze cycle is block weight × number of molds. A 2-pack of 6-lb molds gives you 12 lbs per cycle; a 4-pack of 8-lb molds gives you 32 lbs. If you plan to freeze all at once, the pack count determines if you need one freezer run or several. Also check your freezer shelf space — some packs come with molds that stack vertically, saving horizontal space.
FAQ
How long does it take to freeze a large ice block?
How many ice blocks do I need for a cold plunge tub?
Can these silicone molds be used in a dishwasher?
Why does my ice block come out uneven or bowed at the bottom?
How do I easily remove a large ice block from the mold?
Is silicone safe for making ice blocks for drinking?
Can I use these molds for things other than ice, like soap or candles?
Will a 12-lb ice block fit in my cooler?
Why does the product data say 0.5″H for some molds?
Final Thoughts: The Verdict
The MT.BAY Ice Block Form 12 Lb is the best container to make ice blocks for most people. It makes the single largest block on the list (12 lbs), and its metal-reinforced rim stops sagging so you get a clean brick every time. If you want three stackable molds for a full 36-lb batch, grab the Alaskey 3-Pack 12 lb. And for budget-conscious buyers who just want to dip a toe into block ice, the Haldane 2PC 6LB gives you two reliable molds at the lowest price.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, WellFizz earns from qualifying purchases. This does not affect which products we feature.
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Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.