OVV3D Filament Storage Bags 30pcs, Plus Size 32X34cm 3D Printer Filament Storage Bags Vacuum Sealed Kit with 30 Desiccants, Auto 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.

These storage bags are easy to use and hold the vacuum well. The pump works as expected. Highly recommend CFH

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.

Been in the bags 2 and a half weeks.... still holding. Pump is simple.... the little gadget to zip the bag is awesome. I highly recommend. Great product!

I have thrown 3 bags away already having lost their vacuum within 2 weeks multiple times. Each time I used their clips and pressed down with my fingers to ensure the seal. I will be returning them and looking for a replacement value item.

they do fit a regular 1kg roll, but the mouth of the bag is a tight fit. you have to squeeze the roll through. not ideal for people with only two hands to work with, but they do work. the four i've used so far have all been air tight, the hand pump works (even though the placement of the valve in the corner of the bag is not ideal, but still usable), and my fingers aren't always dry enough to slide the zipper closed easily, so i appreciate the little slider clips. just remember you're supposed to smooth the air valve with your finger to seal it after using the pump.

I used 13 of the 20 bags so far and over a month later, all 13 are still holding vacuum, no signs of leaks. I just followed the directions and the vacuum hand pump worked great.