I do not use O2 absorbers. I evacuate (suck the air out of) the bags and pack jars solid. Unless the leaf needs to age more, then I hydrate to 70%, pack loosely and let it go aerobe/anarobe. Mostly, I haven’t tested O2 absorbers with tobacco to ruling out some bad interation, so I don’t use them. My vacuum packer will do a gas flush, though. I should probably use it.