Cheap coral shipping containers.

[ohio reefer]

Picked up twenty 10 packs of no spill paint cups with locking lids at a learning store down the street. They're having a sale and they were normally 10.99$ per pack and now they are 1.00$ and buy one get one. I bought 20 packs for the price of one. I got everyone off the shelf. They're about 4-5 inches tall. Beats what I normally pay for my containers.

 

[Pmark]

What some vendors do is use Dixie soufflé cups and make a cross hatch mark in the center at the bottom of each. Then they push the plug through and smaller plastic bags to avoid the frag from bouncing around too much. Your way is way sturdier and you got a steal.