Quick answer: for genuinely wet days, choose a roll-top dry bag rucksack with welded seams. For showery days and commuting, a water-resistant pack with a rain cover is usually enough.
Waterproof vs water-resistant: what is the difference?
A waterproof backpack uses coated or laminated fabric with sealed (welded or taped) seams and a closure that keeps water out, usually a roll-top. A water-resistant pack sheds light rain but water can get in through zips and stitched seams in a downpour. If your gear must stay dry, such as a phone, spare layers, a laptop or a camera, go fully waterproof.
The main types of waterproof backpack
| Type | Best for | Watch out for |
|---|---|---|
| Roll-top dry bag rucksack | Hiking, camping, boating, wet UK weather | Slower to access than a zip |
| Waterproof-zip pack | Commuting, travel, everyday carry | Zips add weight and cost |
| Water-resistant daypack + rain cover | Showers, dog walks, light use | Not fully sealed in heavy rain |
| Tactical / work pack | Tools, EDC, field use, durability | Usually water-resistant, not submersible |
What size (litres) do you need?
- 10 to 20L: dog walks, short walks, spare layer and a flask.
- 20 to 30L: full-day hikes, fishing, work days out.
- 30L and above: overnight trips, camping or carrying bulkier kit.
What to look for
- Sealed seams: welded or taped seams matter more than the fabric alone.
- Roll-top closure: fold it at least three times and clip it shut for the best seal.
- Comfortable straps and a chest strap: padded, adjustable straps make a big difference over distance.
- External pockets and attachment points: handy for bottles, poles and a dog lead.
- Visibility and colour: a bright pack is easier to spot on the hill.
Our picks
Our own 4 Elements 20L Roll Top Waterproof Dry Bag Rucksack suits day walks and dog walking, and the larger 30L version gives you room for a full day out or a weekend away. If you want a tougher, organised pack for work or field use, see our 5.11 backpacks and rucksacks. For the full range, browse all backpacks, day packs and rucksacks.
Frequently asked questions
Are roll-top backpacks fully waterproof?
A well-made roll-top pack with welded seams is designed to keep rain out. Roll the top down at least three times and clip it closed for the best result. Not every roll-top pack is designed to be submerged, so check the product details.
Is a waterproof backpack better than a rain cover?
A waterproof pack protects from the inside out and cannot blow off or get snagged. A rain cover is lighter and cheaper, but water can still run down your back into the pack.
How do I care for a waterproof backpack?
Rinse off mud with lukewarm water, air dry fully before storing, and avoid harsh detergents or tumble drying, which can damage coatings and seams.
What size waterproof backpack do I need for walking?
Most people find 20 to 30 litres right for a day walk. Choose 30 litres or more if you are carrying extra layers, food and equipment.
Keep exploring: how to wash and reproof a waterproof jacket, or see all our buying guides in The Field Guide.
