I wrap them in freezer paper, then stick that in a heavy duty freezer bag. When I freeze them, I freeze them between two aluminum cake pans. That way they don't have a bump in the side. That seams to extend the life a bunch. I get plenty when I order vaccines for the cattle.I've tried the exact type pictured many many times. The epoxies and such I use in my work come packed in them, which makes them free to me. They always seem to leak when I use them, talk about a slimy mess.


