Conterra Strike ERT Pack Wing Tanks Made to go with Conterra's Strike ERT Pack System (Sold Separately) Securely attaches around the Strike ERT Pack, adding over 1,500 cubic inches of storage. Side pockets are 30" long each, with waterproof/ dust proof zippers. The bottom pocket is 6"X 6" X 12" and opens with a #10 waterproof zipper.