Lately I've been buying up 5-packs and 10-packs of D'Addario EXL120s. Not only am I getting  excellent deals by buying the strings from the U.S. (compared to prices here in Australia), the multi string packs at the moment have great bonuses like the Chordmaster and the S.O.S. mini tuner.

At last count I had 32 sets of 120s and 5 sets of 125s. The strings come in corrosion resistant sealed packs although I'm guessing that some slight rusting still occurs.

Am I being realistic to expect the strings to be like new when unwrapped in 3 or 4 years time?

Slightly off-topic: The 120s and 125s are close in gauge (9 to 42 vs 9 to 46). Would anyone recommend a truss rod adjustment when changing between the two sets?

'70 and '06 SGs
'75 strat
'87 Charvel Model 4
'89 PRS Custom 24
'98 G&L American Legacy
'06 Flying V

"Restringing is my life"

Those bags do help a lot, and your strings should sound new for quite a few years if you keep them sealed.  Putting the majority of those sets into an air-tight container would also ensure that they stay in perfect shape.

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McSpadden M-12W, SH-12CRs, SH-12KKc
Custom LR Baggs Piezo Bridge Pickup on SH-12KKc
LR Baggs Para Acoustic DI Preamp
DigiTech & Boss Effects, Planet Waves Cables and Picks, D'Addario Strings
SWR Super Redhead 450w Combo Amp with SWR Goliath Jr. III Extension Cab