Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating Water-resistant stitched construction Lightweight, universal Velcro attachment system attaches to the top of rack Padded/insulated construction controls internal temperature and keeps load quiet - perfect for transportation of snacks Main compartment expands vertically for an additional 2.9L / 177 cu/in Side pockets expand to provide an additional 5.8L / 254 cu/in Top bungee system for additional, flexible storage Ultra-stiff polypropylene backing plates built into fold-down pockets External rear zippered pocket Internal mesh pocket in lid Adjustable internal divider Velcro Straps 7.9x11.8x5.9� 1135 c.i. (expanded) Grey/Black XXX-Large (700+ c.i.)