How to keep 115 pound bale of hay fresh for 2 guinea pigs?

okay my guinea pigs will be eating 1st cut locally grown timothy hay and it comes in 115 pounds. i alraedy got it and now i donno were to store it. i heard yahoo answerers telling me it will last longer than how long my guinea pigs will live! So i am concerned about freshness. there is no refunds and its kinda far from me but pretty local! D: i couldnt get a flake of it so i just got the bale! help me . and thanks!! will it lose its nutrion value. how do i maintain it to be fresh and nutritious! Tahnkkss yahoo answerers xD