You finish your open water swim, reach for a fresh towel, and find the entire contents of your bag soaked through. A leaky dry bag turns a great workout into a frustrating cleanup. The difference between a bag that works and one that fails comes down to the seam construction, the closure system, and the fabric’s actual waterproof rating — not the price tag.
I’m Mohammad Maruf — the founder and writer behind WellFizz. I spent weeks analyzing the material thickness, seam welding techniques, and real-world customer failure reports across dozens of models to find the ones swimmers can actually trust.
Whether you need a floating buoy for lakes, a compact sack for pool gear, or a large backpack for family beach trips, this guide breaks down the five best options for keeping your valuables dry. Here is my curated list of the best dry bag for swimming on the market today.
How To Choose The Best Dry Bag For Swimming
A dry bag for swimming faces unique demands that a standard hiking dry bag does not. Constant exposure to moisture, potential submersion, and the need to carry wet swimsuits require specific construction traits. Focus on these three factors to avoid a soggy disappointment.
Closure System: Roll-Top vs. Zipper
The roll-top design is the gold standard for full waterproofing. You fold the top down three to four times and clip the buckle — this creates a mechanical barrier that keeps water out even when the bag is submerged. Zipper closures are convenient for quick access but rely on a waterproof zipper track that can fail over time. For swimming, choose a roll-top bag unless you only need splash resistance.
Material and Seam Construction
PVC (polyvinyl chloride) is the most common material in the mid-range segment because it is rugged, affordable, and fully waterproof. The downside is weight and stiffness. Nylon dry bags, like those using Cordura ripstop, are significantly lighter and pack smaller but cost more and may tear if punctured. Regardless of fabric, ensure the seams are welded or tape-sealed — stitched-only seams allow water ingress through the needle holes.
Capacity: Liters and Your Gear Load
Capacity directly dictates what you can carry. A 10L to 20L bag fits a towel, change of clothes, phone, and keys — ideal for a solo pool or lake session. A 35L bag handles multiple towels, shoes, a separate wet compartment, and a phone case, making it suitable for family trips or full gym-to-swim transitions. Overfilling a bag prevents a proper roll-top seal, so leave some empty space above your gear.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Earth Pak 10L | Roll-Top PVC | Everyday open water & travel | 10L capacity, IPX8 phone case included | Amazon |
| Lamicall 20L | Roll-Top PVC | Kayaking & paddleboarding | 500D PVC, dual backpack straps, floating | Amazon |
| ProCase 35L Swim Buoy | Inflatable Buoy | Open water swimmer visibility & safety | 35L, double air chamber, tow-behind design | Amazon |
| Sea to Summit Ultra-Sil 8L | Ultralight Nylon | Minimalist & travel organization | 8L, 30D Cordura, 69g weight, 2000mm waterhead | Amazon |
| Maelstrom Swim Backpack 35L | Zipper Backpack | Gym-to-swim & family outings | 35L, separate shoe/wet compartment, 7 pockets | Amazon |
In‑Depth Reviews
1. Earth Pak 10L Waterproof Dry Bag
The Earth Pak earned a Wirecutter recommendation for good reason. Its 10L roll-top body is built from thick PVC with welded seams, and it includes an IPX8-certified phone case rated for submersion — a rare pairing at this tier. The single shoulder strap adjusts from 24 to 42 inches, making it easy to carry over one shoulder or attach to a kayak D-ring. Multiple sizes (5L through 55L) let you scale up if family trips are on your calendar.
Customer reports consistently highlight the bag’s durability even under heavy use — one user took a 55L and 40L version on a multi-day horseback camping trip and reported bone-dry contents after kneeling on the fully packed bags to burp out air. The soft-rubbery PVC material compresses well and does not crack in cold weather. A five-year manufacturer warranty backs the build quality.
The phone case fits phones up to 6.5 inches diagonally and features dual-sided clear windows for camera use. Some users reported that the home button on older iPhones felt unresponsive through the plastic, but touchscreen operation works reliably. The initial chemical smell from the PVC fades after a vinegar-and-water rinse.
Why it’s great
- Trusted roll-top seal with compression burping
- Certified IPX8 phone case included free
- Five-year warranty and honored replacement service
Good to know
- PVC material has a strong initial odor
- Shoulder strap is a weaker point at maximum load
2. Lamicall 20L Waterproof Dry Bag
Lamicall’s 20L dry bag targets water sports enthusiasts who need a bag that stays afloat when dropped. The high-density 500D PVC fabric with airtight welded seams traps air inside when sealed, turning the bag into a buoyant platform. Its IPX6 rating handles heavy rain and wave splash while the included IPX8 phone pouch provides double-layer protection for your smartphone. The olive green color blends well with natural water environments.
The two fully adjustable, detachable backpack straps are a major upgrade over the single-strap designs found on most dry bags at this level. A sternum strap provides additional stability during active use. The front zipper pocket is splash-resistant for quick access to sunscreen or keys — but Lamicall clearly warns that electronics belong in the main roll-top chamber, not the exterior pocket. Reinforced cross-stitching at all stress points addresses a common failure area in budget dry bags.
Users report the 20L size comfortably fits gear for two people during flatwater tubing or port excursions — ID, camera, GoPro, tumbler, and sandwiches. Some note that the single-strap versions on smaller sizes are less comfortable, so the dual-strap arrangement on the 20L makes a real ergonomic difference. The two-year warranty is above-average for this segment.
Why it’s great
- Floats when sealed — no lost bag in the water
- Ergonomic dual backpack straps with sternum clip
- Heavy-duty 500D PVC with welded seams
Good to know
- Front pocket is splash-resistant only, not fully waterproof
- Bag size runs large before rolling the top down
3. ProCase 35L Swim Buoy Dry Bag
This ProCase unit is not a standard dry bag — it is a swim buoy with a 35L dry storage compartment. The bright orange color makes you highly visible to boaters, jet skis, and lifeguards while you are swimming. A double airbag design ensures that if one chamber is punctured, the second still provides flotation. The bag tows gently behind you without adding noticeable drag, and the detachable shoulder straps convert into a waist belt for use as a buoyancy aid.
The dry storage chamber is separate from the inflatable air chamber, so your clothes, towel, and phone stay dry even when the buoy is deployed. Built-in front and rear inflatable nozzles allow quick inflation and deflation — the entire unit packs down small when empty. The PVC material is non-toxic and durable. ProCase clearly warns against putting sharp objects inside the dry compartment, as punctures from the inside will compromise the bag.
At 35 liters, this bag fits a full set of beach gear for one person plus some extra items for a family. Customers in Hawaii used it to hold wallet, keys, and a purse while snorkeling at the Kaneohe Sandbar and praised its float capability. A few users were skeptical of the 35L claim but confirmed it fits a towel, shoes, keys, wallet, and phone with air volume still available. The double chamber gives peace of mind that a single puncture will not sink your gear.
Why it’s great
- Double air chamber provides puncture redundancy
- High-visibility orange increases open-water safety
- Converts from dry bag to buoyancy aid
Good to know
- Requires inflation — not ready out of the box
- Sharp objects inside can puncture the dry compartment
4. Sea to Summit Ultra-Sil 8L Dry Bag
When weight and packability matter more than ruggedness, the Sea to Summit Ultra-Sil is the clear choice. At just 69 grams (2.4 ounces) for the 8-liter version, this bag barely registers in your luggage. The 30D Ultra-Sil Cordura ripstop nylon carries a 2000mm waterhead rating — meaning the fabric can withstand a 2000mm column of water pressure before leaking. That is more than sufficient for swim bag duty, rain protection, and even submersion if you roll the top correctly.
The Hypalon roll-top closure uses a field-repairable buckle that Sea to Summit claims can be replaced in seconds without tools. Double-stitched and tape-sealed waterproof seams reinforce all stress points. The fabric is semi-translucent, letting you see approximately what is inside without opening the bag. The oval base resists rolling on uneven surfaces, a nice touch when setting the bag on a rocky beach or boat deck.
Customers use these bags for everything from hotel laundry to packing wet swimsuits at the end of a trip. The slippery material makes sliding the bag into a backpack effortless. Note that the 30D nylon is lightweight and can tear if stressed against sharp objects — this is not the bag for carrying tools or rough gear. It excels as an internal organizer or an ultralight day bag for swimmers who already carry a main pack.
Why it’s great
- Extremely lightweight at just 69 grams
- 2000mm waterhead rating exceeds swim bag needs
- Semi-translucent fabric for easy content visibility
Good to know
- Thin 30D nylon can tear if overloaded with sharp items
- 8L capacity is best as a supplement, not a main bag
5. Maelstrom Swim Backpack 35L
The Maelstrom Swim Backpack is a zipper-closure bag designed for swimmers who need organization over submersion protection. Its 35L capacity holds four towels plus gear for a family trip. The standout feature is the separate shoe and wet compartment at the bottom, made from thickened, upgraded leak-proof lining — this compartment can hold ice cubes and drinks, doubling as a small cooler for the beach. Seven total compartments include a laptop sleeve, three interior zippered pockets, two side mesh pockets, and waterproof bottle pockets.
The backpack uses waterproof polyester with a wide-mouth zipper that allows easy loading and unloading. Ergonomic shoulder straps with breathable back padding keep it comfortable even when fully packed. A Velcro patch on the front pocket allows personalization with morale patches or team flags, and hanging loops on both sides provide a place to clip goggles or a water bottle. The bright yellow color is easy to spot in a crowded pool deck.
Customers who swim three to four times per week praise its lightweight feel and the separation of wet and dry gear. The bottom compartment fits a pair of shoes or a wet swimsuit without soaking the main compartment. Some users noted that the side bottle pockets are shallow and the side zip pockets become inaccessible when bottles are inserted. The external cord may stretch with frequent heavy use. For swimmers who prioritize organization and a cooler-like wet compartment over full waterproof submersion, this is the most practical choice.
Why it’s great
- Separate bottom compartment doubles as cooler
- Seven pockets for organized gear storage
- Comfortable backpack straps with breathable back panel
Good to know
- Zipper closure is splash-resistant, not submersible
- Side bottle pockets are shallow
FAQ
Can I swim with a dry bag strapped to my back?
How many liters do I need for a pool session with a towel and change of clothes?
Do I need a separate phone case if the bag is already waterproof?
Final Thoughts: The Verdict
For most users, the dry bag for swimming winner is the Earth Pak 10L because it delivers a proven roll-top seal, a free IPX8 phone case, and a five-year warranty at an accessible price point. If you want a floating bag for open water safety, grab the ProCase 35L Swim Buoy. And for family trips or gym-to-swim transitions where organization matters more than submersion protection, nothing beats the Maelstrom Swim Backpack 35L.
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.