Comfort-fit Web Master™ Harness frame ensures good structure, stability, and load dispersion. Padded comfort, secure fit, generous ergonomic cut, and full range of motion. Five-point adjustable fit to accommodate dogs of all sizes and shapes. * Weight-forward saddlebag design for ideal load-carrying position. Lightweight streamlined shape for restriction free roaming. Waterproof zippers that stay shut. * Daisy chain allows you attach other gear on top of the bag. High-visibility reflective trim for low light conditions. Grab loop and two leash attachment options. * Sizing: measure girth around the widest part of the rib cage. Medium fits 26-36 in. (66-91 cm) and holds 732 cu. in. (12 L).