Well, I get to fly home tomorrow after a long work trip in the morning. I want to go to the LFS here in Anchorage to purchase some 1/2" Acro frags for $5 each. My concern is how long will they be ok for? As I have to buy them before I go to work tonight and fly before the LFS opens in the morning. Will be in each individual bags for about 18 hours and I will carry them on the plane with me. TYIA