I don't think I've ever used a ziploc bag for SV since I own two clamp vacuum sealers.
I do use ziploc bags for other things, and I've noticed that over the years, they keep getting fancier looking and lesser life spans. It seems that they hired engineers to figure out how to make the seals only usable once or twice before the bag or seal fails.
Some bags have perforations between the two seal strips, these could be the cause of problems in some instances.
Also, depending on the slider design, it might not seal 100%. While this is fine for storing stuff in the refrigerator or a lunchbox, once you get it in the water, it could open up and leak.