@shetc Like you, I had leftover Reflectix (foil bubble wrap) after wrapping a carboy fermenter with a heat belt. I wrap it around the stock pots I use with the Anova.
I also cut out a "lid" as an alternative to shrink wrap, towels or ping pong balls.
Both the wrap and the lid work great and are much easier to roll up and put away than dealing with other containers, coolers and ping pong balls in a limited space kitchen.
Scissors and duct tape make it easy to create insulation wraps or bags for square and rectangular containers.