Provided are a photographing control method and apparatus according to motion of a digital photographing apparatus. Data indicative of a power constraint of a first computing device using the wireless communication device may be transmitted to a second computing device. The support assembly further includes an elastic member elastically biasing the locking member to the releasing position and a pressing member provided on the cover for pressing the locking member to remain in the locking position when the covered is closed to cover the opening. The improvements include a reduction in weight, simplified installation, a lower number of constituent parts, and a resulting reduction in overall cost. The pressure vessel includes a vessel liner forming a hollow tube and including a plurality of layers with an aperture formed therein, wherein at least one of the layers is a barrier layer and an end cap coupled to the vessel liner, wherein the end cap has a plurality of layers, and wherein at least one of the layers of the end cap is a barrier layer.