I purchased 6 x 500ml bottles of 60mg PG last night, and I'm wondering if it's okay to pack the jugs in zip-lock bags for freezing? I don't think the PG will freeze solid, so I'm concerned that the solution will react with the plastic over time. My plan, is to expand a 1 x 500ml jug into 15mg and 7.5mg strength bottles for 12 watt and 30+ watt vaping. I'm hoping that I can freeze the remaining 5 jugs of 60mg (in their plastic containers) for future use. I want to order a case of amber glass containers, but I need to find some thick USA made amber bottles.