How long would you expect a pack of foil sealed strings to last?
A couple years back I got loads of packs of Ernie Ball Cobalt strings that were on offer. They were in foil bags and I thought they'd be good for a long time. i've still got a few bags, but the last I opened today was pitted with, what I guess is rust? They've been kept in reasonable ( for the the U.K.) conditions.
Thought it might be interesting to tap into the wealth of knowledge around here and ask for opinions on how long to expect a pack of strings to last.