Waterproof bag for watersports: drybag, backpack and more
A waterproof bag is a bag or pouch with a sealing system that prevents water from reaching the contents, even during submersion or prolonged spray. That's what sets a drybag apart from a regular water-resistant bag: a drybag is hermetically sealed via a roll-top closure or screw cap, whereas a water-resistant bag only has a coating that repels light rain but not submersion.
For SUP, kayaking, sailing or a beach day, the right drybag protects your phone, keys, camera and clothes no matter how wet it gets. The range runs from small phone pouches of 0.5 litres up to large backpacks of 100 litres and more.
Waterproof bag types overview
| Type | Volume | Use | IPX rating |
|---|---|---|---|
| Roll-top drybag small | 2 to 10 litres | Phone, keys, wallet | IPX6 to IPX8 |
| Roll-top drybag large | 15 to 40 litres | Spare clothes, wetsuit, food | IPX6 to IPX8 |
| Waterproof backpack | 20 to 30 litres | Day trips, SUP and kayak | IPX6 |
| Waterproof hip pack | 3 to 8 litres | Kitesurfing, surfing, quick access | IPX6 |
| Waterproof phone case | 0.5 litres | Phone on board, floating | IPX8 |
| Boat bag / beach bag large | 50 to 100+ litres | Day out, boat, beach | IPX4 to IPX6 |
Roll-top vs other closures
The roll-top closure is the most common system for watersport drybags. Roll the opening at least three to four times tightly and click the buckle shut. The more rolls, the better the seal. A correctly closed roll-top achieves IPX8 on most models, but only if the top is completely dry and clean before rolling. Sand or dirt in the fold significantly reduces waterproofing.
Besides roll-tops there are waterproof zips (YKK Aquaguard or Tizip) used on backpacks. These are more convenient in daily use but slightly less watertight during prolonged submersion than a well-rolled roll-top. Check out our SUP collection and our inflatable kayaks for more watersport gear where a drybag is essential.
IPX ratings explained
IPX stands for Ingress Protection for water. IPX4 is splash-proof from any direction: fine for rain but not for waves. IPX6 withstands powerful water jets, suitable for most watersport activities. IPX7 means submersion up to one metre for 30 minutes. IPX8 is the highest rating and covers prolonged submersion deeper than one metre. For SUP and kayaking IPX6 is the minimum; for kitesurfing and offshore sailing choose IPX8.
Frequently asked questions about waterproof bags
What's the difference between a drybag and a regular water-resistant bag?
A regular water-resistant bag has a DWR coating that repels light rain, but with prolonged rain or submersion water seeps through the seams and fabric. A drybag has no external seams: the roll-top or screw cap seals the contents completely from water. With a correctly closed roll-top at four rolls, the contents are protected even during submersion. The big difference is not the material but the closure system and seam construction.
What size drybag do I need for SUP or kayaking?
For a short SUP session with just a phone, keys and a snack, 5 to 10 litres is plenty. For a half-day or longer trip with spare clothes, food and a repair kit, count on 15 to 20 litres. For a multi-day kayak trip with tent and sleeping bag, two 30-litre drybags make a great combination. As a rule of thumb: fill a drybag to a maximum of 80 percent so there's enough air left for buoyancy and a good roll-top seal.
How do you use the roll-top closure of a drybag correctly?
Make sure the opening is dry and clean. Fill the bag to a maximum of 80 percent and push out the air by pressing the opening together. Fold the opening flat with no creases at the sides. Roll the folded opening down at least three times tightly, four rolls for maximum waterproofing. Clip the buckle on both sides. After every roll, check that no air bubbles are escaping. Always open the bag after use to let the inside dry.
What IPX rating do I need for my watersport?
For sailing or SUP on calm water, IPX6 is enough. For kitesurfing, surfing or kayaking where the bag regularly ends up in the water, go for IPX7 or IPX8. For phones on the water, IPX8 is the minimum, since a fall can temporarily put the bag fully underwater. Always check the official IPX specification of the product and not just the marketing copy: look for the IEC 60529 certification on the label.
In stock? Order before 17:00 and it ships the same day. Otherwise, as soon as possible. Not sure which waterproof bag suits your watersport? Our specialists in Joure are happy to help.
