It's easy to pull out poop bags one-by-one through side opening, and the dispenser holds one standard roll of poop bags. Attach the dispenser to your leash  or backpack with the rope on the top so you never forget your poop bags. You can also slide your leash through the clip on the back to ensure the poop bag dispenser stays in place while you're walking your dog. 

Each dispenser comes with a roll of 15 compostable poop bags and refills can be found here.