We know what it is like to walk your dogs and suddenly realize you are down to the very last bag on your roll. The Original Poop Bags® Countdown Rolls® are individually numbered from 15 to 1 on every roll, so you know exactly how many are left on your roll. These patented bags are certified as USDA Certified Bio based at 38%. With 15 bags per roll, these pet waste bags fit most leash attachment dispensers. 120 bags per box, bags measure 9" x 13".