I forgot to add I sometimes notice the bag accumulates some kind of gas sometimes, and may be harder to keep the food in the bag submerged. Does that happen to anyone else? I looked it up once, but don’t remember what I found.
The other thing I sometimes use is a “spider” ( thanks @kobuta Kobuta; I couldn’t remember what it was called), with a meat pounder in it. But the bag sometimes gets away from it.
