Dr. RH MRI Humidifier

I didn't realize how much moisture was building up in my gun safe until I popped one of these in. The crystals absorbing 400 times their weight is no joke—it's been bone dry in there for three weeks now. The airtight seal held up perfectly straight out of the package.

The ultrasonic weld on these is incredibly clean, no leaks at all. I’ve been using them to stabilize humidity in my guitar case, and the crystals absorb moisture noticeably faster than the silica packs I used before.

Finally got these for my music room and the ultrasonic weld really does keep them completely sealed—no mess at all. The crystals are already pulling moisture out of the air noticeably after just a few days.