Check silica packet effectiveness below 50% humidity… It’s not great. Molecular sieve on the other hand has no problem getting humidity below 5%. I managed to buy a 10kg bucket of 3A sieve for about $120 and it’s going to be enough for many years.

I store all my filament in ziplock bags with some 3a molecular sieve - even after 2 years in 45-65% humidity at 21C room I don’t have to dry PETG.