I've got 2 carrier bags full of old (around 10-15 years) family photos. Mostly still with their negatives, in the envelopes they came in from the processors. I don't want to paste them all into albums - most of them aren't worth the effort, TBH. But I don't want to get rid, either. I've read that common plastic or cardboard boxes can damage the photos long term - so what's the best way of storing them?