Is the seal not good enough?
I've got 5 of the 1lb Grove bags, I really like them.
But if I sealed them with my vac pac I'd not be able to keep doing it repeatedly
True. But what I do is I get several of the 1-ounce size and then I weigh out an ounce (or so) in each one, heat seal them all. and then store them in a cool, dark place. I break open an ounce, as needed, and then I fill my little glass jar with the buds from that ounce, that I will be smoking for the day (or so). I use the zip lock on the bag AFTER I have cut open the heat seal, obviously. That works great for short-term use. In the meantime, the other bags stay sealed for longer term, which allows them to do their gas-exchange thing. If you just use them for short-term use and continually reopen the bags, you will reintroduce more oxygen each time, causing faster degradation. If you keep the bags heat-sealed, then, eventually, the oxygen is driven off by the way the material is designed to trap some of the volatile gasses and allow oxygen to be driven out.....something like that, anyway.
I use an impulse sealer and I try to position the Grove bag so that it will be sealed as close to the top as I can get. I use a razor blade and a straight edge to cut just below the seal and leave enough room to reseal the bag if needed. Like, say I open an ounce bag, but then a week later, decide I'm tired of it, I can just reseal it and put it back into storage.
