Why Odor Sealing Dog Poop Bags Are EssentialStandard poop bags contain waste but do nothing to stop smells from permeating through the plastic. Meet the Smarter Alternative: Multi-Layer Odor DefenseOur brown odor sealing dog poop bags tackle the smell problem at the molecular level. While other brands simply add more plastic, we engineered a new multi-layer barrier that traps odors where they start.