I have had things like this on and off over the years, and I found that I didn't use them frequently, and also had to deal with the cost of specialized bags. I have, however, found something that is VERY inexpensive and can work nearly as well, especially for freezing meats and keeping cheeses fresh. This is Kenji Lopez from Serious Eats, explaining how to get air out of a ziploc bag (by submerging it in water). https://goo.gl/po7yP0 I've done it, and it works!
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