MadPax Lator Gator Spike Backpack Bookbag (Halfpack, White) Fullpacks measure approx. 18"H x 14"W x 8"D. Fullpack features adjustable shoulder straps with chest strap. Fullpack features Features a large inner compartment, small inner zippered pocket, two outer zipper side pockets. Halfpacks measure approx. 14"H x 12"W x 6"D. The halfpack has a center cavity and an inner zipper pocket.