It has five pouches: 3 mag pouches which can hold up to 6 standard m4 mags 2 in each, a general purpose pouch and a hydration pouch. The GP pouch is a little too small to hold a normal sized hpa tank but could hold the smaller ones. It also has two strips of elastic which will keep smaller items from falling out. Over all dimensions are roughly 11x15 inches. Dm for more photos. I can't ship outside of the lower 48