Btw, I don't think this has been discussed much on this list, but I don't think it is a good idea to cook in plastic bags that were not meant to have food cooked in them. Ziplock bags and most other such bags were not made to be food safe at cooking temperatures. There are some pretty unhealthy chemicals that can leach out of soft plastics into the food when the bags get hot. Bags designed to be cooked in have (at least in theory) been formulated to minimize the nasty stuff that leaches out. Bags meant only for storage were formulated with storage in mind and are likely to have stuff that will leach out at temperature. I would be cautious about doing much sous-vide cooking in bags not meant to be cooked in especially if you are going to be feeding kids or young adults or women that might be (or become) pregnant. The chemicals used to make plastics pliable are known to be endocrine disruptors and pose other health risks as well. While there is some "controversy" on this topic, there is growing consensus about the health risks of these chemicals in the scientific community (except for that part of the community funded by the industries that rely on these chemicals for their profitability--hence my putting controversy in quotes since most of the disagreement is from the side with a vested interest). ← Ziploc offers sous-vide bags now. You can get a pump and three bags for less than $10. Ziploc says they are microwave safe, but doesn't give any specifics on sous-vide water temps. I think if you buy the bags by themself, you end up spending like $0.30 a bag or something like that.