ArtBin Tote Express, Black/Gray Rolling Art Craft Storage Bag,6922SA Complete unit measurements: 18 x 13 x 30.5 inches; Top Unit 18 x 13 x 16.25 inches; Bottom Unit 18 x 13 x 14.25 inches Top unit: 26 individual loops on inside cover for markers, brushes, etc, and large back pocket holds up to 12 x 12-inch books, papers, and projects. Top unit: shoulder strap with shoulder pad to easily transport top unit separately. Bottom unit: large, open base easily accomodates bulkier supplies and contains solid wall inserts for both units. Double reinforced side handles for secure lifting and sturdy double skate wheels. Top Unit is shipped inside Bottom Unit, some assembly required.