3D Printer Filament Storage Kit (Pack of 5) Includes: 5 Resealable Nylon/LDPE Gusseted Plastic Bags, 5 Large Oversize Rechargeable Clay Desiccant Drying Packs, 5 Humidity Indicator Cards

I'm still trying to figure out why 'print quality' and 'adhesion' are things on which you can rate plastic bags. :-) But that's neither here nor there.These bags did a quite good job. There is a straw included, so you can suck the air out of the bags before sealing them. Of course, this works best if you zip the bag all the way down to the straw in the end of the zipper seal, and hold it tight against the straw while you suck out the air, then yank the straw out and complete the seal. It's easier than it sounds. It's a decent substitute for vacuum sealing the bag, which can only be done once unless your vacuum sealers' heating element doesn't work, or you are really talented with sealing the ziplock and pulling it out of the vacuum sealer before the heating element turns on.. :-)The seal is not absolutely perfect, but it does a pretty good job. The desiccant packs are powerful enough to keep it pretty arid inside, even without a 100% perfect seal. The thing I liked the most was the little humidity sensor cards. They do a very good job of giving you a visual read out of humidity levels.Nothing against the bags, but I wound up using the desiccant packs and one of the sensor cards inside a large well sealed plastic bin for storing multiple spools of filament. I still have the bags, and will use them if I have too many spools to go in the bin, or if for whatever reason, I need to take some filament with me on the road. I live in a fairly humid region, so even if I'm taking filament over to a friend's house to use on his printer, I will probably bag it and put a desiccant packet inside. Something like that would probably be a short enough Journey that the humidity wouldn't get to it, but it's always good to expect the unexpected, and be ready for whatever might happen. :-)Even though I'm not using the bags, I do not regret the purchase one bit. If you know you don't have a need for individual bags for spools, you would do just as well to buy some strong desiccant, get some sensor cards like the ones that come with these, and get a large sealed bin like the one I have.

I bought two sets of these bags, and am about to buy more. Unlike what Gary says, all of my bags appear to be airtight if properly zipped up. You can verify this by zipping them up while empty, then trying to pull the walls apart through the bottom seam to suck air in - mine don't budge. They're thick enough that I think they'll be durable for a while. I store filaments in the bags, and then store the bags in a big plastic storage container on top of that, so even if the bags weren't perfectly airtight there's not much if any airflow and it's better than no bags or letting the filament sit out. The fact that the desiccants are rechargeable is a bonus, as these kits should last as long as you can keep from punching a hole in a bag.

These appear to be made for using a vacuum sealer when vacuuming out the air, so when I saw that my stuff included a red disposable straw like you'd get for a milkshake, I was obviously confused. Despite having great lung capacity, there's no way I can suck hard enough to get a proper vacuum in the bags, and getting light-headed isn't all that fun when trying to take care of 5 bags of filament.So far the seals are ok-ish (again hard to properly tell due to the fact that I cannot get a proper vacuum or tightness in the bags without a vacuum sealer or other device. Unlike the Tick, whose superpowers will let him use a straw as a weapon, I just can't suck hard enough to get it to where it needs to go. It's also not really all that fun to play beat the clock when trying to do it with that straw, because air is leaking back in as you're trying to breathe out all the air you just sucked in. Pinching it off only does so much after all.

After having some filament moisture problems I got these bags and desiccant wondering if they really work. Almost all of the filament problems are gone. The stringing and uneven levels are gone. And that's with PLA which people say has fewer problems with moisture. This is cheap protection for expensive filament. I looked at food dehumidifiers but this way I can protect all my filament all the time instead of one spool at a time and much cheaper.

I have 3d filament in each bag. After 1 month of use in the damp NorthEast, moisture level has not increased inside bags. Moisture dete tion tags work good. I had one left out of the bag and it changed overnight. Not sure if these are a long term solution for some who may take months to get through a filament spool but definitely worth it for shorter term.

I just purchased a 3D printer. The one thing I read was keep the filament dry. I have now had these bags about 2 months. The bags are heavy duty with a humidity monitor strip and desiccant. I also purchased some electronic humidity monitors and place one in each bag. The bag is easy to seal and stays sealed and keeps the humidity in the correct range.

I purchased 2 orders, which is 10 bags. ALL 10 LEAK!!! Very disappointing. If you want a bag that is the right size for 3D Printer Spools, these bags fit perfectly. If you want a bag that will hold a vacuum, these will loose the vacuum within 1 hour.