Three winters ago, as an experiment, I tried PW humidipaks. I had seven out of fifteen humidipaks leak, two of them were leaking when I opened the brand-new box.

Expensive crap. Never, never again.

I’ve used Music Nomad Humitars for humidifying ever since - simple and reliable. In the summer, I use Wisedry desiccant packs in the cases to keep RH in range.