Besides being four or five times as expensive, they make it nearly impossible to squeeze out the air that's in with the food. :(
Any tips where they can be still be found?
I also have looked and looked found this online
at www.primeonlinestore.com use their search feature for "Gallon twist tie food storage bags" only thing is that you need to buy a case of 24 boxes that have 50 bags each pulse shipping. I have always used them and will always use them so I did not care a bit. with my shipping to my part of the country it added up to about 4 cents a bag. Hope this helps.
If youre talking about the bags,
First, they leak out and that can cause slip/falls and pathogen build up in a commercial kitchen. They also could "leak in" which could cause dangerous contamination. In a commercial kitchen we usually use lexan and IF we use bags, they must have a POSITIVE SEAL
Second, the twist ties themselves often become "lost" and get into food. We call this a physical contamination.
I still see bags used in home kitchens, but they are becoming harder and harder to find because they make more profit on a zip style bag. It's all about the Benjamins.
If you're talking about the vacuum machine, since it's drawing out OUT, not blowing air IN, I can see your point! But the machine itself isn't sterilized every time it's used.