Looking for a new backpack? This might be the thing for you. The material of choice for this bag is polyester and things you want to keep extra track of can go in the inner pocket.
From Regatta Great Outdoors
Regatta Atholl II 35L Rucksack Dark Denim Nautical Blue, Size: One Size - Sale
House of Fraser
Regatta Atholl II 35L Backpack - Blue