Bags On Board Dispenser Bone comes with your first 30x Bags on Board waste bags included (comes as 2 rolls of 15 pet waste bags). Bags on Board Dispensers attach to any standard or retractable leash, so you'll always have a poop bag when you need it. Bags on Board Bags have double-sealed seams to make them stronger and are leak-proof guaranteed. The Bone poop bag dispenser has a sturdy, compact design and holds 15 large dog poop bags. And, when it's time to refill, simply twist off the top and reload with a fresh roll of bags.