Designed to hold a water bladder, wet weather clothing etc. Mesh on the front to help keep the water in the bladder cool. There is two sets of Molle to distribute the weight. It has a strong zip across the top and down each size 200mm. There is two zip sliders so something longer than the pouch can be carried bringing the sliders close to the item. Made the back Cordura, strong polyester mesh & webbing, YKK zip and strong domes. Dimensions; length 440mm, width 180mm, depth100mm.