5L · 10L · 20L · 30L · 35L · 55L
For most people a 10–20 litre dry bag is the right size: enough for a towel, a change of clothes, your phone and lunch, without becoming a sail on a paddleboard. Drop to 5L if you only need valuables kept dry, and go 35–55L for a full day's kit or a multi-day trip.
| Size | Best for | How you carry it | Colours | From |
|---|---|---|---|---|
| 5 litre | Valuables only | One removable, adjustable shoulder strap | 7 | £13.99 |
| 10 litre | A towel and a change of clothes | One removable, adjustable shoulder strap | 7 | £16.99 |
| 20 litre | A day out, carried on your back | Two removable straps, adjustable to 122cm — wears as a backpack | 7 | £19.99 |
| 30 litre | Full day, or an overnight | Padded shoulder straps with an adjustable sternum strap | 6 | £24.99 |
| 35 litre | Expedition day pack | Padded straps and back pads, splash-proof zip pocket, mesh side pockets | 6 | £38.99 |
| 55 litre | Multi-day and expedition | Padded straps and back pads, splash-proof zip pocket | 6 | £48.99 |
Buying for two, or want a spare? The 2-pack gives you two bags of the same size and colour — 10L, 20L or 30L — from £15.99.
Valuables only
The smallest we make, and the one to buy if the job is simply keeping your phone, keys and wallet dry while everything else gets wet. It slips inside a bigger bag as a valuables pouch, clips to a boat or a belt, and takes up almost no room when empty.
What fits inside
Carry: One removable, adjustable shoulder strap
See the 5 litre
A towel and a change of clothes
The size most people actually need. Ten litres swallows a towel and dry clothes for one person with room for lunch — the classic beach, riverbank or poolside bag. If you are hovering between this and the 20L, the question is whether you are packing for one person or two.
What fits inside
Carry: One removable, adjustable shoulder strap
See the 10 litre
A day out, carried on your back
The first size that is a proper backpack rather than a sack with a strap. Two extra-long straps adjust out to 122cm, which is four inches longer than most brands manage, so it sits comfortably over a wetsuit or a winter coat. This is the everyday size for a day on the water.
What fits inside
Carry: Two removable straps, adjustable to 122cm — wears as a backpack
See the 20 litre
Full day, or an overnight
Where the carrying system steps up: padded shoulder straps and a sternum strap, so a heavy load stays put when you are moving. It is also the size we describe as fully submersible, which is the one to pick if the bag is likely to go in the water rather than just get rained on.
What fits inside
Carry: Padded shoulder straps with an adjustable sternum strap
See the 30 litre
Expedition day pack
The most featured bag in the range and our bestseller with search-and-rescue crews. Padded straps and back pads spread the weight across your shoulders and lower back, there is a splash-proof zip pocket with a window so you can see what is in it without opening up, and mesh side pockets for a bottle.
What fits inside
Carry: Padded straps and back pads, splash-proof zip pocket, mesh side pockets
See the 35 litre
Multi-day and expedition
The big one, for multi-day trips and expeditions where everything you own has to stay dry. It is the size we point Duke of Edinburgh groups at when a whole expedition kit list has to go in one bag. Be honest about how much you will carry — a full 55 litres is a serious load.
What fits inside
Carry: Padded straps and back pads, splash-proof zip pocket
See the 55 litre