Hump big 50 ltr waterproof rucksack coverthe h50 is the big brother of the hump range. It accommodates those large backpacks that are used for multi purpose activities.it easily fits over a 50 ltr backpack whilst maintaining the cross fastening method found on the rest of the range.like the others in the range, the h50 fits over an existing backpack and fastens around its waist. It also features an elastic binding that secures the cover firmly to the backpack stopping it from flapping around or parting company with the bag. And because its waterproof you can concentrate on what youre doing rather than what your bag is not doing.featuresmaterial 100% nylon1 3rd more volume than standard coverswaterproof material with taped seams3m reflective transfer for night time reflectivityflo yellow colour for day time visibilitymesh pocket for quick access40 50 litres 10 13 us gal capacityre useable backpack coverbuy hump clothing from chain reaction cycles, the world's largest online bike store.