Don't put oil in the bag. Oil tends to actually ruin orings after a long time. Buna are less likely to be ruined by oil, but Urethane orings definitely absorb the oil and lose elasticity.
Just leaving them in a box or a bag, out of direct sunlight and out of crazy extreme temperatures is more then sufficient. You'll probably lose the orings before they go bad.
"Originally posted by YeloSno: comeon guys, I need pro paintballer, not pro buttbanger info here."