39 and 38 respectively to provide secure closure of the valise structure when mutually engaged fig2 illustrates in perspective view a valise 40 formed from double shell 12 upon removal of the detachable components of hand truck 10 and the folding of half cylindrical sections 16 and 18 on hinge 14 until they meet along edges 38 and 39 the opposite ends of the resulting cylinder are closed by plugs with end plug or closure 43 shown fitted between the half cylindrical sections 16 and 18 alternatively the opposite ends of valise 40 may be closed by boots fitted over the outside of half cylindrical sections 16 and 18 the interior faces of half cylindrical sections 16 and 18 may be grooved to receive end plug 42 wheels 24 and 26 carrier 32 and handle 34 may be stored inside valise 40 a strap handle 44 is attached to an exterior face of half cylindrical section 18 openings 30 provide for ventilation of valise 40 referring to fig3 hand truck 10 is depicted carrying a scuba tank 46 tank 46 is secured within half cylindrical section 16 by a strap 48 which is wrapped around the scuba tank the exterior of the half cylindrical section and the lower portion of handle 34 the bottom of tank 46 rests on lateral carrier 32 handle 34 is mounted to the back.