Diamond Vision Published May 19, 2009 Team Hill First Sergeant's HILL AIR FORCE BASE, Utah -- Attaché case, gym bags and backpacks (AFI 36-2903, pg 90, item 12) Carried in left hand, on left shoulder, or both shoulders (not to interfere with rendering the proper salute). Attaché case: black only; Gym bags: black or dark blue; Backpacks: Only solid-color black backpacks may be worn with blue uniform combinations; solid-color black, olive drab, or woodland camouflage are the only colors authorized with the BDU/ABU. Conservative manufacture's logo is allowed. Members may wear backpack using one or both shoulder straps.