How to choose a dry bag
Updated June 2026Independently researchedNo paid placement.
A dry bag is your best bet for keeping gear dry on the water or in wet conditions, but not all are created equal. Focus on material durability (TPU is lighter and more flexible than PVC), roll-top vs zip closure based on submersion risk, and size that fits your activity without being overstuffed. For most buyers, a mid-range TPU roll-top in the 20–30 liter range offers the best balance of weight, waterproofness, and value.
What is a dry bag and why do you need one?
A dry bag is a flexible, waterproof container designed to keep the contents bone-dry when submerged, splashed, or rained on. Unlike a regular backpack or duffel, it has a sealed closure, usually a roll-top, that creates an airtight barrier. Paddlers, rafters, and hikers use them for phones, clothes, camp gear, and electronics, but they are also handy for everyday commutes in wet climates or for beach trips. The key difference between a dry bag and a waterproof phone pouch is durability and capacity: dry bags are built to handle rough handling and full submersion, while pouches are lighter and flimsier. For serious water sports or multi-day trips, a proper dry bag is non-negotiable.
What are the best materials for a dry bag?
The three main materials you’ll encounter are PVC (polyvinyl chloride), TPU (thermoplastic polyurethane), and nylon with a waterproof coating. PVC is the most affordable and extremely durable, but heavy and less flexible in cold weather. It’s a solid choice for car camping or river rafting where weight isn’t a concern. TPU is lighter, more flexible, and more eco-friendly than PVC, but it costs more. It’s preferred by backpackers and kayakers who need to save weight and pack space. Nylon dry bags with a waterproof coating are often the lightest and pack the smallest, but they are less abrasion-resistant and may not last as long under heavy use. For most buyers, TPU offers the best trade-off: good durability without the bulk of PVC.
Roll-top vs zip closure: which is better?
Roll-top closures are the gold standard for waterproofness. When properly sealed (three to five rolls, no air inside), they can be fully submerged without leaking. They are simple, fail-proof, and require no zipper maintenance. The main downsides: they take a few extra seconds to close, and if you pack the bag too full, the roll becomes difficult to secure. Waterproof zippers (like TIZIP or YKK AquaSeal) are more convenient, just zip and go, but they are heavier, more expensive, and prone to failure if dirt or sand gets into the teeth. A zip bag is better for quick-access items (e.g., camera gear) but should not be trusted for deep submersion. For 99% of water activities, a roll-top bag is the safer and more cost-effective choice.
How to choose the right size dry bag?
Size is measured in liters, and the right volume depends on what you plan to carry. For a day outing (a change of clothes, lunch, phone), a 5–10 liter bag is plenty. For an overnight trip (sleeping bag, pad, extra layers), 20–30 liters is typical. For multi-day expeditions or group gear, 40–55 liters is common, and some duffel-style bags go up to 70+ liters. A common mistake is buying a bag that is too large, a half-empty bag seals poorly because the roll becomes stiff and uneven. Aim for a bag that is 80–90% full when packed. If you often carry a mix of small and large loads, consider getting a set of two or three bags in different volumes. Many paddlers carry a 5L for electronics and a 20L for clothes.
What features matter most for different activities?
For kayaking and canoeing, look for a bag with a D-ring or lashing points so you can secure it to the boat. A bright color (yellow, orange) helps visibility if it goes overboard. For backpacking, weight and compressibility are critical, go with a light TPU or coated nylon bag that rolls down small when not in use. For rafting and rough water, prioritize extreme durability: a heavy-duty PVC bag with reinforced seams and a thick bottom. For everyday commuting or travel, a bag with a comfortable shoulder strap and a top handle is more convenient than a bare cylindrical bag. If you plan to use it for electronics, consider a transparent window option so you can see the screen through the bag (though these are less durable).
Frequently asked questions
Are dry bags 100% waterproof?
A properly sealed roll-top dry bag is effectively 100% waterproof for submersion down to a few meters for short periods. However, no dry bag is indestructible, punctures, improper rolling, or leaving air inside can cause leaks. Zippered dry bags are less reliable for full submersion.
How do I roll a dry bag correctly?
First, squeeze out as much air as possible by pressing down on the bag. Then fold the top flap down tightly three to five times, making sure each roll is snug against the contents. Finally, clip the buckle or snap the side straps to hold the roll in place.
Can I put a dry bag in a washing machine?
It’s not recommended. Hand-wash with mild soap and cold water, then air-dry away from direct heat. Machine washing can damage the waterproof coating and wear out the seams. Wipe down the inside with a damp cloth to remove sand or salt.
What’s the difference between a dry bag and a waterproof stuff sack?
A dry bag is designed for full waterproofness, often with a roll-top closure and robust materials. A waterproof stuff sack is lighter and may use a simple drawstring or flap closure, it’s splash-resistant but not submersible. Use a stuff sack for inside a larger dry bag or for brief rain exposure.
How long do dry bags last?
With proper care, a good-quality dry bag can last five to ten years. The main failure points are abrasion holes, UV degradation (if left in the sun), and worn-out roll-top buckles. Store dry bags loosely rolled, not compressed, and keep them out of direct sunlight when not in use.
Can I use a dry bag for electronics like a phone or camera?
Yes, as long as you choose a clear window style or a small dedicated dry bag for electronics. For full submersion (e.g., kayaking), a roll-top bag is safest. But note that pressure at depth can still force water past seals, for scuba or deep water, use a specialized waterproof housing instead.