i put fresh eggs in the plastic egg holders and then put that within a one gallon ziplock - we had eggs break once, and as others have mentioned, that is not fun in july

as far as them keeping, i have used eggs as much as 5 days into a trip - i give them a flash boil (10 seconds) before we go - it doesn't cook them, but based on discussions with my uncles (a doc) he says that can help them keep longer, and potentially kill off diseases