The bag comprises a base which is designed to rest on the ground. Two straps (4) are attached at one end to the top part of the bag and at the other end are anchored to the ground by pegs (5). Two eyelets (6) at the bottom of the bag are anchored into the ground by the pegs. One side wall (2) of the bag supports the user's back when in the sitting position. The straps are removable from the bag and can be used as carrying straps. The pegs can be stored in loops (8) fixed either in or on the bag.