100% Polyester; UA Storm technology delivers an element-battling, highly water-repellent finish; Soft-lined laptop sleeve holds up to 13" sized laptop; Large vented main compartment with internal organization; Dual-direction extra deep water bottle pocket & one exterior valuables pocket; Works as both a backpack & duffle with removable duffle strap; Welded Hypalon modern molle webbing for additional attachment points; Padded air mesh back panel & PU-coated body fabric for ultimate durability & breathability; Gusseted laundry and shoe pocket placed at bottom;