Throw in a few desiccant beads inside the working bottle, and add a cotton ball inside to close it off. But the reality is, no matter what method you use, poppers expire. You'll know when the smell is more noticeable than anything else lol. ...
Try a vacuum bag, put inside again desiccant packets or silica gel beads, and force the air out of the bag with a pump. It's more suited to store the filament that will not be used very frequently. If you happen to have a cat and use the crystal cat litter, you can borrow so...