Glass jars would be ideal, but it makes scaling up difficult. If you had access to old glass carbuoys from a beer or winemaker and wouldn't mind fiddling with a diamond saw and rubber gasket material, that would make for larger batches, but that's a lot of work.
There's always the idea of recycling plastics with oyster mushrooms
. I don't know if anyone here has managed it yet, but it is apparently possible, or at least conceivable.
, where a member discusses and shows pictures of wax moth larvae and the job they do on styrofoam is inspiring for its potential, too, though I would want to have them and their feces analysed in a lab before I use them anywhere. It could be that they are sequestering the plastics in themselves and in their feces, as opposed to breaking them down into their constituent components, like fungi will do.
In that case, I would use the wax moth larvae as a first stage of decomposition, and then I would kill them and gather their corpses and feces up to be inoculated with oyster mushroom spore, which would probably have an easier time breaking down the already-somewhat-digested plastics.
If this method of disposal works, any plastic that could be sterilised adequately could be employed with the intention of submitting it to an aggressive and complete biological decomposition.
Free substrate bags that become substrate for oyster mushroom crops, and we start actually getting rid of plastic pollution. Sounds like a win-win to me.