Funk Fighter back packs use a high-quality carbon lining to trap and eliminate odors, while waterproof inner zippers protect your contents. At 13.5 x 7.5 x 20, they feature a large main zipper compartment. Funk Fighter back packs use a high-quality carbon lining to trap and eliminate odors, while waterproof inner zippers protect your contents. At 13.5 x 7.5 x 20, they feature a large main zipper compartment, a small zipper compartment on the front, adjustable straps, 2 mesh pockets on the sides, and a carry handle on the top