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?
If i understand the issue correctly, would simply shipping them less full work?
This may seem counter-intuitive, but air in this case is the problem, so filling it less introduces more air (which is compressible) versus liquids which are generally incompressible.
But OP mentioned the bottles they use are not great so the problem they face may really be about getting better containers.