Freezing nic, I prefer fixed cap (no dripper) plastic Amber bottles. Amber Glass would probably be better. I really like the 30/60/120 ml bottles that style. They all use the same cap. And they fit in your pocket better than glass. Here's the url: http://www.sks-bottle.com/340c/fin21b.html These are not the super clear, slightly hard ones. These are super squeezable. I like them a lot. Labels stick fairly good. Like I said, Amber is just all around better for freezing and not oxidizing as much, IMO. Good luck!

Edit: I use the 4 oz also to keep my popular flavors' mix. I.e.: I put my recipe of just extracts in that bottle, and add that end mix at 8-15% or whatever a bottle calls for. It works great for dripping into a syringe or weighing it out.

I dunno if it's for everyone but shipping cost shows 17.76 for me, and when I roughly crunched the numbers I got about $.46 cents, still a good price but I know a lot of people assume regular shipping price and buy something before checking, so just mentioning that