Love it. Especially the battery pump included. Don't have to plug it into the USB. A bit tricky to learn the first time. I had to lay the bag flat and hold the pump tightly to the bag. Gotta make sure the pump is level also. Then it works great. Even my plastic vacuum filament containers are failing to hold the vacuum. Constantly have to replace the valve and nozzle. I'm switching to this AMOLEN Filament Storage Bags Vacuum Kit. You got to use that little tool to make sure the bag is sealed. Super easy. Taks up less room as well

These bags are exactly what I needed once I started having humidity issues in my studio. After I dry or use a filament it goes right in the bag with some desiccant and up on the shelf ready for its next use. I have had a few bags fail to seal and air leaks back in, which is unfortunate but for the most part this is a huge benefit to my work process. This was actually my second order, the first one came with a rechargeable vacuum that makes it very easy to use and convenient. I’m not sure that the little moisture indicators actually work as all the circles stay blue whether they are sitting out in the open, dipped in water or sealed up tight.

These are some neat bags if you want to keep your filament nice & dry. Came with plenty of bags for me, I've just been swapping my filament out of the same 2 bags since I got it, and they've been holding up to repeated use. The mighty mini vacuum works really well, just be sure to charge it completely before you use it for the first time, and try to keep the sucker sticker on a flat surface. Oh, and try not to eat those tasty looking silica packets.

The bags are nice and fit 1kg rolls of filament but have a soft flap that doesn’t seal well to the vacuum. It takes some maneuvering with the vacuum pump to get all the air out. Overall not a bad product for the price.

Was going to compare eSun and Amolen's filament bag system but was shocked to find out they both provide fake humidity indicators that lie. The indicators on the top (in photo) are from "excellent technologies". These are included in both eSun and Amolen's filament bag packages. Clearly they do not indicate anything relative to the digital monitor and a few I purchased from the Dry & Dry store. This gives the false impression that the bags seal out all moisture and also misleads you that your filament is bone dry, leading to bag quality prints and wasted filament. Back to the review I intended.. Size: eSun's bags are slightly larger so it's very easy to get a filament spool in. Amolen's require two hands and good alignment to get the spool inside. Vacuum device: Amolen's USB powered vac device is slightly faster than eSun's vac and feels stronger. eSun's USB suction device is slow but strong enough to draw out all the air. Both are very slow compared to Space saver's plug-in suction vacuum. Space saver's vac is incompatible with eSun and Amolen. eSun's vacuum works on Amolen. Amolen's does not work well with eSun unless you press it down extremely hard to make a seal. The manual pump is very slow and exhausting when sealing multiple bags. I do not recommend. Seal quality: Amolen's seal is essentially tape, and when you use the manual pump, there is a chance to tear the tape. Do not try to remove any air bubbles on the seal with your fingernails as it also may tear the tape. I would not recommend using the manual pump due to the possibility of ruining the seal eSun's seal is encased in plastic so there is no concern about tearing and I have not experienced any bad seals. Thickness: of the bags are thinner than typical ziplock zipper bags, so if you hit your filament spool against a sharp edge while in the bag, it can easily cause a tear. You can easily patch a leaking bag with packing tape. Until eSun and Amolen change their Humidity Indicator vendor, do not purchase their bags if you will be relying on the humidity indicators they provide.

Bought in Dec. Stored filament, and it worked great. Today in March I tried to vacuum seal some bags and they no longer worked. It's as though the round sealer spot is completely closed - no airflow. I tried my other vacuum and it still doesn't work. I tried the other bags in case this one might be defective and the other bags don't work either. The bags go bad after a couple months.

I have used about 10 of the bags, no leaks so far. I dried all of my filament using the Comgrow 3D Printer Filament Dryer Box also sold on Amazon. and sealed up the filament with this kit. My filament became brittle and was breaking because it absorbed moisture, drying it worked for me.

The bags are the right size for my filament spools, and I can seal them up easily. I even use some of the bags for food storage for larger quantities of fresh produce. I especially like the rechargeable vacuum pump as I have injuries to my arms that cause pain when using a hand pump. Easy to charge, easy to use and store. Definitely recommend this item for people with difficulty because of injuries.

The smaller bags have a slight issue where it shrinks at the vacuum point when sealing filament rolls. Still works. Only had two bags open up but I think those rolls were slightly wet.

Everything arrived on time and all parts were there, except for one of the bags was missing the circular seal. The bag is useless without it. Hopefully I can get at least the seal or a new bag to replace it. Update: Company reached out to me and resolved my issue! Thank you so much for the attention to my issue.