I can attest by personal experience, that its BAD to use O2 absorbers in storing sugar-
Had a large batch of gallon jars that I was sealing for rice, pintos and sugar one afternoon.
Filled them, topped with a coffee filter, dessicant pack and O2 absorber and tighten the lids.
OOPS! forgot the sugar wasnt supposed to get the absorbers.... but that was 2 days later
Still cant crank off the lids, and the sugar inside is hard as a rock
Left the 2 gallon jars on the shelf but drilled a small vent hole to break the seal & taped over it.
Gonna try a couple strap wrenches on it eventually to get those lids off and chip out some sugar rocks
For now they are visual reminders of a lesson learned, at the risk of #12 of sugar
I like the pop bottle & added rice ideas for salt, gonna give that a try. THANKS!