Which size dry bag do I need?
- 2–5L: phone, keys, wallet and a first aid kit.
- 10L: a warm layer, a hat and gloves, or the day's food.
- 15–25L: spare clothes, a down jacket or a small sleeping bag.
- 35L: a full-size sleeping bag, or a waterproof liner for a whole daypack.
Several smaller bags in different colours are easier to pack and find things in than one big one. Many walkers keep one colour for clothes, one for food and one for electronics.
Dry bag backpacks
A dry bag backpack is a roll-top pack made from waterproof fabric with welded or taped seams, so the whole pack keeps water out rather than relying on a rain cover. They suit kayaking, canoeing, cycling and wet commutes. SealLine's dry packs come in daypack and larger expedition sizes.
How to close a roll-top dry bag
Push out as much air as you can, fold the top over on itself at least three times, then clip the buckle. The folds make the seal, so fewer rolls means less protection.
Dry bag FAQs
Are dry bags fully waterproof?
A properly closed roll-top dry bag keeps out rain, spray and splashes. Most lightweight dry bags are not designed to be held underwater for long, so check the product details if your kit might go overboard or into a river.
Dry bag or rucksack rain cover?
Both, ideally. A rucksack rain cover stops the pack soaking up water and weight; dry bags inside keep your kit dry when rain gets past the cover. Dry bags are the one to choose if you only buy one.
What is the difference between a dry bag and a compression sack?
A dry bag is designed to keep water out. A compression sack uses straps to squeeze a sleeping bag or clothes down to a smaller size. Some bags do both; otherwise put a compression sack inside a dry bag.
See all rucksack accessories or browse our hiking backpacks and rucksacks.
