A bag including a bag body having an inlet and defining a storage compartment, and a resiliently flexible strap attached to the bag body and biased to extend away from the bag body to facilitate insertion of an arm therethrough. A spring member, such as a strip of resiliently flexible material, extends substantially the length of the strap, such as in a sleeve or padding thereof. A fastener may be used to attach the strap adjacent to the bag body so as to substantially close an opening between the strap and the bag body.