Maxpedition Gear O Negative Blood Type Patch We finish our bags with a triple coat of polyurethane for water resistance and add a final coat of DuPont Teflon Fabric Protector to repel the elements. Only the best components and designs are used. We use complete YKK zippers and slides exclusively unlike our competitors who put YKK slides on generic zippers. we add military grade nylon webbing for straps, handles, and modular attachment points. Genuine Duraflex buckles and hardware add strength and functionality. Starting with large, unseamed panels of 1000 Denier Nylon, we meticulously reinforce each stress point with composite thread. No unnecessary seams or polyester parts are used 1.5-Inch (L) x 1.1-Inch (H) x 0.12-Inch (W) Made from PVC rubber Includes additional loop field lined sheet for sewing onto clothes or protecting hook back when not in use