bobe ,good idea , but a much cheaper option is to buy several of those cheap plastic
'storage" containers that are readily found in those one dollar type shops
the sizes are from 5x litres to 80x litres , they have a sealable lid so clearly you would need to drill some small holes in lid and even place a few drops of water on the inside bottom for the 5x litre one , to
75ml for the 80x litre one
the temp would soon equalise to the fridge and the RH would quickly rise to circa 85/95%
QED,,,,,,,and bloody easy on the pocket