I oftentimes ship a sauce only sold in my area to family at different elevations. The problem is that the bottle it’s sold in isn’t very secure and many times it’ll break in transit and leak everywhere.
What should I look for when shopping for bottles/containers to use for shipping?
You just need to have as little air in the container as possible, it’s the air that expands as it good up in elevation. If it’s glass, fill it all the way. But plastic that you can squeeze all the air out of seems better if you can keep it sealed tight. Piece of tape over the flip top?