Unscrew the cap and fill a dog poop bag roll in the poop bag dispenser. Our dog waste bags refill rolls take just seconds to replace. No more mess in your carry bag, and no more stress to hurriedly look for a bag to pick up your dog poop! Use the carabiner clip to secure the poop bag dispenser to dog leash, dog collar, backpack or key chain anywhere, so the waste bags are always within easy reach. The bag dispenser can be refilled by any poop bag rolls in a standard size. 15 bags per roll.