I've always disliked deli cups for shipping, I don't like the way the lids fit and I don't want to use tape to secure them. I suppose I could purchase some large rubber band but still worry about the container deforming and the snakes escaping. Until now I just put the deli cup in a snake bag and zip tie the bag shut. In the process I lose a snake bag.
I could always start shipping my snake inside a round ziplock container with a screw on top but they are expensive too.
I think I may have found a cheap(free) container that solves the problem.
This is a 15oz plastic peanut butter jar. Drill a few vent holes and there you go. No chance of escape and they don't go in the landfill. With all the different sizes of containers in our homes I'm sure I will find plenty to suit all the shipping needs I have.