Product Review

Features:

Roll top and buckle closure allows for air-tight protection against water/liquids
Large capacity Dry Bags keep your belongings safe for kayak fishing, camping, boating, rafting, canoe trips
Easy to carry & will comfortably put on your backpack. Just toss your gear inside, roll it down, and you're good to go on your next adventure

Specification:

10 LTR: 15.7 × 13.3 in / 40 × 34 cm (H×W)  Weight: 2.8 oz / 80 g
The compact 10L dry bag is suitable for those who want to pack light but still have quality, heavy-duty gear that will protect valuable possessions from the outdoors.
Suitable for small personal items you'd like to protect from the elements: cell phone, wallet, sunglasses, camera, toiletries, small towel, water bottles, etc.

20 LTR: 18.5 × 15.7 in / 47 × 40 cm (H×W)  Weight: 3.7 oz / 105 g
The medium-sized 20L dry bag is big enough to carry everything you need for a day trip, without being a bulky, hassle to carry.
Suitable for small and medium-sized items you'd like to protect from the elements: cell phone, camera, clothing, towels, toiletries, shoes, etc.

40 LTR: 24.4 × 21.2 in / 62 × 54 cm (H×W)  Weight: 4.9 oz / 140 g
The 30L dry bag backpack is extremely durable and convenient for those who are looking for a reliable companion that will join them in trekking the outdoors for more than just a day.
Suitable to pack in more than a day's worth of items: a weekend's worth of clothing, survival kits, water/food containers, etc.

70 LTR: 27.5 × 24.8 in / 70 × 63 cm (H×W)  Weight: 5.8 oz / 165 g
The 70L dry bag backpack is for those looking for a durable outdoor bag that will provide their belongings with maximum protection for a trip that can last up to a week.
Suitable to pack in more than a trip's worth of items: wetsuit, towels, two people's clothes for a long weekend, small sleeping bag, etc.