I start them freezing in a large bag all separated, then use my Foodsaver vacuum sealer to seal them up tight. Those hand held ones are ok...but 1- they loose strength of suction really fast, and 2- the air can sometimes get back into those bags. An actual vacuum sealer is much more reliable, albeit more expensive. But they pay for themselves really quick.
Whatever you do, Stop buying rodents from Petsmart/Petco!!! I used to work there and have seen how those things come in. They get freezer burn, and smell when thawed which is NOT good. Either start ordering from a rodent supplier or breed/freeze your own...but do it soon.
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