Best Dry Bags for Backpackers: Waterproof Bags for Beach Days, Boat Trips and Island Hopping
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Comparison table
| Spec | Matador FlatPak 8L ★ | S2S Big River | S2S 20L Big River + Sling | S2S Lightweight | S2S Ultra-Sil |
|---|---|---|---|---|---|
| Sizes | 8 L (2 L also sold) | 5–65 L | 20 L | 1.5–35 L | 3–35 L |
| Weight | 83 g | 135–433 g | 250 g + 109 g sling | 34–115 g | 30–74 g |
| Published water rating | IPX7 | 10,000 mm HH | Waterproof when not submerged | 10,000 mm HH | 2,000 mm HH |
| Fabric | 70D ripstop nylon | 420D nylon, TPU laminate | 420D nylon | 70D recycled nylon | 30D Ultra-Sil CORDURA |
| Construction | Fully welded | Tape-sealed seams | Roll-top, lash loops | Fully taped seams | Taped seams |
| Carry | Grab handle, D-ring | Lash points, D-rings | Detachable sling | D-ring at buckle | None |
| Link | Check current price | Check current price | Check current price | Check current price | Check current price |
Boat spray, wet towels and tropical showers come with any beach-and-island trip. These bags cover three jobs: keeping valuables dry on the water, carrying beach kit, and organising your main pack. All specs and water ratings come from the makers' own product pages.
Matador FlatPak Dry Bag 8L: the best overall
Matador FlatPak Dry Bag - 8L
- 8 L; 83 g
- IPX7 rated; fully welded construction with roll-top closure
- 70D ripstop nylon
Best for: Backpackers who want a light bag rated for brief submersion on boat days
Check priceThe Matador FlatPak Dry Bag - 8L is our top pick for backpackers, and the only bag here with an IPX7 rating. Matador says it's fully welded and explains IPX7 as surviving submersion up to 1 metre for 30 minutes, provided the roll-top is properly secured. That makes it a natural home for your phone, passport and power bank on boat days.
It weighs 83 g and has a clear vertical window, a flat bottom that stands up when packed, plus a grab handle with a carabiner loop and a D-ring tether point. Matador lists the fabric as 70D ripstop nylon, PFAS free and covers it with a one-year warranty. If you only need room for documents and a phone, there's a 2 L version at 43 g.
Specs
- 8 L; 83 g
- IPX7 rated; fully welded construction with roll-top closure
- 70D ripstop nylon, PFAS free; clear vertical window
See the Matador FlatPak Dry Bag - 8L
Sea to Summit Big River Dry Bag: the toughest for boat decks
Sea to Summit Big River Dry Bag
- 5 L to 65 L; 135 g (5 L) to 433 g (65 L)
- 420D nylon with TPU laminate; triple-coated base
- 10,000 mm hydrostatic head; tape-sealed seams; lash points
Best for: Travellers whose bag gets dragged across decks, rocks and boat floors
Check priceBoat floors and rocky landings wear out thin fabric, and the Sea to Summit Big River Dry Bag is built for that. It uses 420D nylon with a TPU laminate, a triple-coated base and double-stitched, reinforced, tape-sealed seams. Sea to Summit rates the fabric at a 10,000 mm hydrostatic head.
Sizes run from 5 L (135 g) to 65 L (433 g). Lash points and D-rings let you strap it down, the white interior helps you find small items, and the oval base stops it rolling. Sea to Summit says to avoid submersion, because water can seep through the roll-top of any dry bag.
Specs
- 5 L to 65 L; 135 g (5 L) to 433 g (65 L)
- 420D nylon with TPU laminate; triple-coated base
- 10,000 mm hydrostatic head; tape-sealed seams; lash points
See the Sea to Summit Big River Dry Bag
Sea to Summit 20L Big River Dry Bag with Sling Strap: the best for carrying to the beach
Sea to Summit 20L Big River Dry Bag with Sling Strap
- 20 L; dry bag 250 g
- sling 109 g
- Detachable Dry Bag Sling with 3D mesh shoulder pad; loads up to 9 kg
Best for: Backpackers who want one hands-free bag for towel, snacks and dry clothes
Check priceThe Sea to Summit 20L Big River Dry Bag with Sling Strap pairs the same tough 420D Big River bag with a detachable Dry Bag Sling. The sling has a 3D mesh shoulder pad and is rated for loads of up to 9 kg. Sea to Summit pitches it for carrying to "the beach, boat or in downpours".
The bag weighs 250 g and the sling 109 g. Sea to Summit lists it as waterproof in situations where it won't be submerged. The sling also fits compatible Sea to Summit dry bags from 5 L to 35 L.
Specs
- 20 L; dry bag 250 g, sling 109 g
- Detachable Dry Bag Sling with 3D mesh shoulder pad; loads up to 9 kg
- 420D nylon; hypalon non-wicking roll-top closure
See the Sea to Summit 20L Big River Dry Bag with Sling Strap
Sea to Summit Lightweight Dry Bag: the best all-rounder
Sea to Summit Lightweight Dry Bag
- 1.5 L to 35 L; 34 g (1.5 L) to 115 g (35 L)
- bluesign approved recycled 70D nylon
- 10,000 mm hydrostatic head; double-stitched
Best for: Colour-coding clothes, electronics and toiletries inside a backpack
Check priceThe Sea to Summit Lightweight Dry Bag sits between the heavy-duty and ultralight bags. Sea to Summit makes it from bluesign approved recycled 70D nylon with a PFC-free DWR finish and rates it at a 10,000 mm hydrostatic head. It has double-stitched, fully taped seams, and the maker says it suits paddle sports.
Seven sizes run from 1.5 L (34 g) to 35 L (115 g) in several colours, which makes colour-coded packing easy: electronics, clean clothes, wet swimwear. There's a D-ring at the buckle.
Specs
- 1.5 L to 35 L; 34 g (1.5 L) to 115 g (35 L)
- bluesign approved recycled 70D nylon
- 10,000 mm hydrostatic head; double-stitched, fully taped seams
See the Sea to Summit Lightweight Dry Bag
Sea to Summit Ultra-Sil Dry Bag: the lightest pack liner
Sea to Summit Ultra-Sil Dry Bag
- 3 L to 35 L; 30 g (3 L) to 74 g (35 L)
- bluesign approved 30D Ultra-Sil CORDURA nylon; taped seams
- 2,000 mm hydrostatic head; not intended for paddle or watersports use
Best for: Gram-counters organising gear inside a main pack
Check priceThe Sea to Summit Ultra-Sil Dry Bag is for organising the inside of your backpack, not for open water. It's made from bluesign approved 30D Ultra-Sil CORDURA nylon with taped seams. It starts at 30 g for 3 L and tops out at 74 g for 35 L. The semi-translucent fabric shows what's inside.
Sea to Summit rates it at a 2,000 mm hydrostatic head and says it's not intended for paddle or watersports use.
Specs
- 3 L to 35 L; 30 g (3 L) to 74 g (35 L)
- bluesign approved 30D Ultra-Sil CORDURA nylon; taped seams
- 2,000 mm hydrostatic head; not intended for paddle or watersports use
See the Sea to Summit Ultra-Sil Dry Bag
How to choose a dry bag for beach and boat trips
- Match the rating to the risk. Only the Matador FlatPak carries a published IPX7 rating. Sea to Summit rates its bags by hydrostatic head and advises against submersion. For boat days, keep the items you can't replace in the FlatPak.
- Choose fabric weight for where the bag lives. Thick 420D Big River fabric handles decks and rocks. 70D works for mixed use, and 30D is best kept inside a pack.
- Size for the job. Use 2–8 L for valuables, 13–20 L for a beach day, and 35 L or more to line a main pack.
- Roll it properly. Roll the top down about three times before buckling (Sea to Summit lists dimensions "top rolled 3×").
- Pair it with connectivity and cover. A dry bag keeps your phone dry, and a travel eSIM keeps it useful for ferry times and maps. Compare Airalo and others in our best travel eSIM guide. It's also worth checking that your travel insurance covers water activities. SafetyWing is one of the options in our travel insurance guide for nomads.
Our verdict
For most backpackers, the Matador FlatPak Dry Bag - 8L is the dry bag to carry on boat days. It's IPX7 rated, fully welded and weighs 83 g, so it's a good home for your phone, passport and power bank. Add a Big River for rough handling or the 20L Big River with Sling Strap for hands-free beach days, and use Lightweight or Ultra-Sil bags to organise your main pack.
Shop dry bags: Matador FlatPak Dry Bag - 8L · Sea to Summit Big River Dry Bag · Sea to Summit 20L Big River Dry Bag with Sling Strap · Sea to Summit Lightweight Dry Bag · Sea to Summit Ultra-Sil Dry Bag
FAQ
Can I submerge a dry bag?
Only the Matador FlatPak in this guide has a published IPX7 rating, which Matador explains as submersion up to 1 metre for 30 minutes with the roll-top properly secured. Sea to Summit advises avoiding submersion with its roll-top dry bags.
What does hydrostatic head mean?
It's how much water pressure a fabric resists before leaking; higher is more waterproof. Sea to Summit lists 10,000 mm for the Big River and Lightweight Dry Bags and 2,000 mm for the Ultra-Sil.
Can I use a dry bag as my main backpack liner?
Yes. A 35 L Lightweight or Ultra-Sil Dry Bag keeps clothes dry in rain.
Beach & Island
