Andrew they're frozen solid, I haven't had any squishing guts yet....
They're only $39. I figure it's worth the money I might save on the chance of freezer burnt rats. I consider it a christmas gift to Chief ;D
I also have a shipment of f/t on the way (weaned and small) He won't be ready for the small ones yet but it saves me on shipping charges later on. I order from rodentpro and they're not vacuum sealed so when I get them I will just put them in a big bag and vacuum them all, then when he's ready to step up to them I will seal each one individually.