It is great for who likes hiking or walking with their dog and wants the ability to let the dog carry their own stuff.\r\n\r\n Outdoor saddlebag backpack and chest dual-purpose strap.\r\n Breathable Backsystem to keep dog more comfortable.\r\n With handle makes it easy to help dogs up and over obstacles.\r\n Visible reflective article assure your dog more safety under low light environment.\r\n Ergonomic design distributes weight evenly so your pet is never overly exerted or strained..\r\n\r\n\r\nHow to adjust?\r\n\r\n Step 1: Operate the adjustable buckle to adjust the length to be a comfortable size for your dog.\r\n Step 2: When you need a smaller size,you need to push the adjustable buckle into the buffer strip.\r\n Step 3: Make the adjustable buckle pass through the buffer strip.\r\n Step 4: When the adjustable buckle comes to the other end,you could operate a smaller size.\r\n\r\n DO NOT PUT SOMETHING OVERWEIGHT ON YOUR DOG BODY!\r\n\r\n NOTE:Don\'t put something overweight in the pack, otherwise your pets will uncomfortable.\r\n Be careful, the sharp items like branches ,to prevent scratching.