Can I use Boveda with other humidification devices?

No. Boveda is stand-alone 2-way moisture control. ​ If you introduce a wet sponge, crystals, gels or beads, Boveda will absorb the very high humidity given off by these 1-way humidification devices. So Boveda will do battle with these 1-ways instead of precisely preserving your cigars. Why complicate cigar protection? Toss in Boveda and let it do its job, solo.