To understand IF smell proof bags work, you first need to understand HOW smell proof bags work. There are different methods to lock in smell within a bag or pouch that is odor proof. A common misconception is that you need an airtight herb jar, mason jar or container in order to seal in smelly scents. However, in 2020, this couldn't be further than the truth. There isn't a more effective method to lock in all stinky odors than using activated carbon technology which doesn't have to rely on sealing in air. Instead, the activated charcoal absorbs all the smells. Formline Supply uses only the highest quality activated carbon lining which contains millions (YES MILLIONS!) of micro pockets. These micro pockets work like an odor absorbing sponge which traps in any sort of scent before it can escape the bag, case or backpack. This, in conjunction with a water resistant, ultra durable outer protective layer keeps your contents discreet and your house, car, and office smelling fresh. Unlike generic brands and bags provided by the competition, Formline Smell Proof Bags have a patent pending design that provide 2 times the amount of activated carbon lining per square inch.