Still trying to figure out why 'print quality' and 'adhesion' are things to judge plastic bags by. :-) But it is neither here nor there. These bags did their job well. A straw is included so you can suck the air out of the bags before closing them. Of course, this works best if you zip the bag up to the straw at the end of the zipper and press it firmly against the straw while sucking out the air, then pull out the straw and zip up. It's easier than it looks. This is a worthy substitute for vacuuming the bag, which can only be done once, unless your vacuum sealer's heating element is working or you're really talented at zip-locking and getting it out of the vacuum sealer before the heating element turns . on the. :-) The seal isn't quite perfect, but it does the job. The desiccant packs are strong enough to keep the interior dry even without a 100% perfect seal. What I liked the most were the small humidity sensor cards. They do a very good job of reading humidity levels visually. Nothing against bags, but I used desiccant bags and one of the sensor cards in a large, tightly sealed plastic container to store a few spools of filament. I still have bags and will use them when I have too many spools to toss in the bin or when I need to take some filament with me on the road for some reason. I live in a fairly humid area, so even if I'm taking filament to a friend's house to use on his printer, I'll probably bag it and put the desiccant bag inside. Something like that would probably be a trip short enough that the humidity wouldn't bother him, but it's always good to expect the unexpected and be prepared for anything that might happen. :-) Although I don't use bags, I don't regret the purchase one bit. If you know you don't need separate coil packs, you might want to buy a strong desiccant, get some sensor cards like the ones included in the kit, and a large sealed container like the one I have.
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