I use the Stasher bags for smaller things. Pro tip, for the quart bags you can fit them in a ziplock food saver bag to "vacuum" seal it. Just slide it in unzipped, zip the food saver bag and then vacuum with the attachment whole paying attention and shifting the bag so it doesn't close prematurely. For the half gallon Stasher cut one foodsaver bag extra, extra long and then vacuum manual/pulse vac until the Stasher can be sealed and then release without sealing the foodsaver so you can reuse it bunches of times.
I've also got the SIOchef Premium Silicone Sous Vide Bags on order, I'll try to remember to report back on that once I've tried them. But not sure of utility, because I'm interested in that one because I have a Mellow with a lid I've attached a suction cup hook to that I'm planning to use them with.