I'm new to this, so might not be a lot of help. I bought a package (25 jumbo mice) of frozen feeders from a local supplier last week and they had vacuum sealed them in a single container, so when I got home I separated the mice and vacuum sealed then in individual packages so they would keep longer without freezer burn.
Vacuum sealing them makes them last longer and stay fresher. A ziplock bag is alright if you euthanize your own and are only keeping them in the freezer a short time.
I get mine vacuum sealed and I place them in my own bags and reseal each time I get one out. Vacuum sealers are about $100, but certainly worth it if you have multiple snakes on FT.
**Adriana - White 'N Nerdy!**
1.0 BP 'SunSpot', 0.1 Corn 'Freya', 1.0 IJ BTS 'Topaz', 1.0 ND bunny 'Licorice'