Outside front webbing strap with adjustable hook and loop closure. 26 individual loops in top flap for tools of the trade. Large interior back pocket with protective flap holds up to 12" x 12" books, papers, and projects. Base unit features locking 2-stage handle. Double reinforced side handles for secure support when lifting bottom unit. Sturdy double skate wheels provide smooth transport. Solid wall inserts in both top and bottom units protect interior contents. Large open base to easily accommodate bulkier supplies. Side buckles connect top and bottom units for stability and security during transport. Includes (1) 9000AB acid-free Super Satchel box. Dimensions: 17-1/2" x 13 x 30-1/2".