I think as long as it's cold and sealed the container itself, plastic or glass, isn't a major make or break. I do have some smaller 250 ml and a few 120 ml bottles in there. I only take out one at a time and transfer to a 30 ml bottle that goes in my mix bucket with flavors to work from. No more than 120 ml is ever brought up above freezing at any single time, which I think is the most important method of keeping this stuff lasting as long as possible.