thanks for all the responses I asked rodent pro about it and another frozen food site they said this as the answer.
It depends on how they are packaged, how deeply they are frozen, and the type of freezer they are stored in. Slow exposure to air over time is what leads to freezer burn. Our resealable bags are thick plastic freezer bags, but since the mice are loose inside the bags (more air), and since you will repeatedly open and close them (yet more air), we recommend storing non-vacuum-packed rodents only up to 3 or 4 months (ideally). This is a conservative recommendation -- the "Freezer Guidelines" on boxes of Ziploc brand Heavy Duty Freezer Bags recommend 6 to 9 months for most meat products.
Makers of vacuum packing equipment claim that vacuum-packed foods last from 3 to 5 times as long. If you have to store your rodents for a long time, we recommend this type of packaging.
There is one problem with vacuum-packing -- you must release the vacuum before thawing the rodents. If you prefer to thaw your mice by soaking them in hot water, this means transferring them to a ziploc bag first. If you thaw the mice while they are in a vacuum, they get really messy!
To make your frozen mice last as long as possible, we recommend:
storing your mice double bagged (or vacuum-packed),
squeezing excess air out of the bag each time you reseal it,
using thick plastic freezer bags (not the wimpy ones),
storing them in a deep freezer, if possible, and
always resealing the bags completely.
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