I choose to attach the Puppy stroll "Poop Scoop bag" to. The 'Auroth tactical dog harness’ available on Amazon. and the Team K-9 harness, also online. Both Work well holding the kit on our puppy’s back while rolling on the ground, walking, and /or running. To help secure the pack to the harness I added Velcro strips across the lacing & / or the Velcro strips already attached to the harness. I leave the kit attached to the harness so we are ready to go whenever we have time to get out for a walk, I like feeling confident that we have the needed supplies to pick up any mess that may happen on our walk or anytime, we are out.  Since our puppy loves to go on car rides.