I have a large-capacity antique humidor, seasoned well--but I live in a very humid environment & keeping aging cigars at relatively steady humidity is tricky. I found I was overly fussy with my cigars, not trusting the humidification system I had to do the job.
So I bought a bag of 65% humidity beads from Heartfelt, poured them into three old .22 ammo boxes I had--and away we go! I chose to use the old .22 boxes for both function and aesthetics. First, they're clear, slender and rectangular; they easily fit into the humidor without taking up valuable real estate from the cigars. Second, the plastic grill that fits across the top of the box (the area that the small bullets usually set into) provides plenty of air/humidity to pass through. Finally, the clear sides and tops make it very easy to check whether the beads need a light misting of purified water. And if the beads are a little too dry, easy to mist the top of the box, the water passes/drips through & voila! Easily-maintained humidity.
My set up is the following: I have two hydrated trays of beads on the bottom level of my humidor, and on the top shelf, I have a tray of un-hydrated beads. I feel this lets the humidity & beads sort of breathe--if the base beads are a little too wet--the top rack helps absorb the excess. So far, and it's been a couple months, this structure is working very well. I never worry about over humidification due to that top tray of dry beads, and thus far, the humidity levels within the humidor have been very stable.