Web Master Harness provides load stability and even weight distribution. Lightweight construction and strategic padding keep your pup comfortable. Pack incorporates many of the same features found on your own pack, including stash pockets, coated zippers, and external gear loops. * Padded assistance handle lets you easily help your dog up and over obstacles. Single-piece, anodized aluminum V-ring provides a secure leash attachment point. Reflective trim offers enhanced visibility in lowlight conditions. * Measure around the widest part of your dog�s rib cage for sizing. Pack sizing / capacity:~ XXS�13-17 in. (33-43 cm) / 2 L (122 cu. in.)~ XS�17-22 in. (43-56 cm) / 5 L (305 cu. in.)~ S�22-27 in. (56-69 cm) / 9 L (549 cu. in.)~ M�27-32 in. (69-81 cm) / 12 L (732 cu. in.)~ L�32-42 in. (81-107 cm) / 16L (976 cu. in.). Note: It is recommended that your dog carry no more than 25-30% of their body weight in their dog pack.