So you might find this kind of amusing, but I am a zip-loc-aholic I've used more ziplocs than probably most small towns. I know... the landfills, right ? Sorry. They just work so well, for a million things.
But anyway, I just wanted to go over a few things that might not have been mentioned about using freezer bags (not the regular weight storage bags) for SV.
First off, you want to be really careful not to get seasonings on the zipper. This can... no, this WILL prevent it from properly sealing. Now, what you can do, is to turn the top edge inside out so that you can more easily avoid the zipper when putting your seasoned meat in the bag, "however" with the top edge turned inside out, you need to be really gentle, as overspreading the corners of the zipper, can also cause leaks. If you do accidentally get a little seasoning on the zipper, again with the zipper folded inside out, you can carefully run a small stream of water over it, to wash it right out. Wiping it out will totally not work, and risks damaging the zipper.
Also, do NOT use the type with the little square plastic zipper. Those are made for people who are ziploc 'challenged'.... not SV'ers lol
Watching out for this stuff, I still always double bag everything for SV, but I have yet to have had any of my bags leak.
Oh and BTW, if its any other brand of zip bag, other than Ziploc, it probably sucks ! I learned that way back, and haven't used any other brand since. And no, I don't work for Ziploc, but maybe I should