I use several different size/shape plastic food storage bins/containers {cheap TupperWare} without the lids. I also cut large holes in the container side walls and bottoms to allow cool air flow.
Small 3-Way style Fridge.
'18 320 S, pitched axle, 3020HE; PNW based TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller Adventures: 54Nights: 341 Towing Miles 43,780
Due to its size, our fridge is usually quite packed when we leave. I pack it the night before (while on shore power) so that everything gets good and cold. If there is any room left, I fill it with frozen water bottles. I did buy some adjustable, plastic retainers that attach to the grating...but rarely need them.
When we leave on a trip we have enough food in it that it will hold itself in place. If we don't then we will put stuff in the door shelves and the rest in the large drawer in the bottom of the fridge so it won't move around. We have the Norcold 3-way fridge.
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Small 3-Way style Fridge.
TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
Adventures: 54 Nights: 341 Towing Miles 43,780
2018 Nissan Titan Pro 4X "Big Bird"
Leadville Colorado