OVVNYXE 3D Printer Filament Storage Kit, 20 Vacuum Sealed Bags with 20pcs Desiccant, Hand Pump, Perfect for 3D Filament Storage or Using after Filament Dryer Box

I've been using these for over a year. All but one of them has held the "vacuum", some of them for several months. They can be a bit of a pain to deflate because you have to press the pump onto the valve, i.e., there is no fitting, which tends to push one side against the other. Still, they work well and I'd buy them again.

It takes forever to get any air out of the bag, the seal between bag and pump isn't very good. Real annoying. It works kinda, once you use your leg to back it up. But a bit too cheap it is. Previously purchased product much better.

So far these have worked great for storing filament. I have a desiccant core I put in the spool hole before sealing.

I have had good luck with most of the bags. Some of them have started leaking so within a day I see that air has gotten in to them. I often try to get every bit of air out of the bags so I wonder if continuing to use the vacuum pump a few more times after getting all the air out has caused some to weaken. The last few days I have been making a conscious effort not to overdo it. We will see if that was the cause or just a quality issue. I initially gave a 1 star review because I couldn't get the vacuum pump to suck out the air. Turned out to be an operator error 😂 It can be tricky at times to use the right amount of force and the right angle but it works once you get the hang of it. If no more leak I will be ordering them again ( I ordered twice so far). I probably will have to buy the powered pump next time because no one else here wants to use a manual pump.

Love the quality of these bags. Really good and thick, and hold the seal extremely well!! Only knocking a star off because the pump....yeah it works, but it's very small, and takes a LOT of pumps to get all the air out. Buy it for the bags and dessicant....but do yourself a favor and buy a separate power vacuum pump