NeverXhale is the gold standard for smell proof and odor blocking bags, pouches, organizers, and more to ensure no one gets a whiff of what you are carrying. Stop worrying and start living the NeverXhale way. The exceptional level of odor prevention comes from combining an outer odor-blocking fabric layer, a second 3mm sponge layer for smell absorption, a third aluminum foil layer, a fourth activated carbon layer, and a fifth protective netting.