Green Pups Sustainable Dog Waste Pickup Bags, Multiple Sizes and Counts Green Pups* by Bags on Board Dog Waste Bags Refill Pack are the next generation in dog poop bags made with Xylomer* Technology and natural Lignin Green Pups* breaks down faster than regular plastic dog waste bags Strong material is guaranteed to be leakproof or your money back Does not contain metal additives or require the water and energy needed to grow and harvest corn (compared to other leading brands) Includes built-in odor control and core-less pet waste bag roles further reduce plastic waste; material meets ASTM D6400 commerical compost standard Green Pups* by Bags on Board Dog Waste Bags Refill Pack are the next generation in dog poop bags made with Xylomer* Technology and natural Lignin Green Pups* breaks down faster than regular plastic dog waste bags Strong material is guaranteed to be leakproof or your money back Does not contain metal additives or require the water and energy needed to grow and harvest corn (compared to other leading brands) Includes built-in odor control and core-less pet waste bag roles further reduce plastic waste; material meets ASTM D6400 commerical compost standard