That is another interesting product. Thanks.
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There are various zip seal closure type bags made in heavier thickness plastic out there, its just trade off of weight and cost. I start out with new ziplocks for food storage and eventually reuse them for putting gear in them. I will note the Walmart bags tend to tear out on the ends.
Have you tried putting boiling water in these? I ordered some of the lunch sized bags and the freestanding snack bag 5 pack and these are great. Weight less than the Stashers but have similar zip loc closure. They fit my Peak Refuel meals nicely and save a lot of space. But their website does not indicate you can put boiling water in them. Stasher says they are dishwasher and microwave safe so I assume they are but ReZip does not. They both say freezer safe. I emailed them to clarify but was curious if you've done it. These bags would be perfect if they did.
EDIT: ReZip replied back (fast too and on a SAT no less). Not for heat of any kind, sous vide, etc. :(
No, I haven't tried putting boiling water in them. Besides, my wife would be quite upset if I ruined her bags.