Perfect for water sports and all types of activities, the Yellow 20 Litre OverBoard Waterproof Backpack protects your gear from water, sand, dirt and dust.

Thanks to a unique seamless construction and 2-way roll top sealing system, Overboard's entry level backpack is 100% waterproof and suitable for quick submersion so you can take it out on the water.

They've stuffed this waterproof bag full of handy features too, like a large internal zip pocket (no more rooting around for keys!), elasticated front webbing and more -Ì´å just take a look below at the full list. 
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Specs...   Capacity: 20 Litres / 1,200 cubic inches    Height: 43cm / 17" Width: 24cm / 9.5"   Depth: 16.5cm / 6.5"   Weight: 1.27kg