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Q: Whats the difference between the large and smal kits? Which should I use for a guitar?

I have used the large kit for an acoustic guitar and the small kit for a mandolin and both have worked great for me.

Q: What does this actually come with? large photo shows two double-sided sleeves and four packets, but the description only mentions half as much.

Mine came with 2 double-sided sleeves and 4 packs.

Q: How do they work for instruments that hand and are not stored in the case?

I wouldn’t recommend using it without a case. I would use something like an Oasis guitar humidifier, but they are only for dry environments. It’s preferable to have a dedicated space that is environmentally controlled for wet and dry conditions. I started keeping my instruments in their cases now.

Q: For an acoustic guitar in a hard case, would i put in one pack at a time? two? four? why two sleeves?

I have a pre-war Martin and put in 2 packs in the sleeves hanging from the strings over the sound hole. Also, purchase a small hydrometer to keep an eye on the interior humidity. A lot depends on how well your case seals when closed, but the packs are wonderful.

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🎶 Keep your wood instruments flawless with Boveda’s smart humidity magic!

READY TO USE ANYTIME - Slip it into the leak-resistant pouch and place in your case—no water, no mess, just peace of mind.
LONG LASTING PROTECTION - Effective for 2 to 6 months depending on climate and case conditions—replace only when rigid.
PREVENTS WARPING CRACKING - Precisely maintains 45%-55% relative humidity to protect your investment from damage.
PERFECT HUMIDITY ZERO HASSLE - Maintenance-free 2-way humidity control keeps your instrument safe without any refills or fuss.
UNIVERSAL FIT FOR WOOD INSTRUMENTS - Designed for guitars, violins, clarinets, and more—keeps all your prized wood instruments in peak condition.

Boveda Humidity Control (BVMFK-SM) is a maintenance-free, 2-way humidity control system designed to protect fretted, bowed, and woodwind instruments by maintaining an optimal 45%-55% relative humidity. Lasting 2-6 months per pack, it prevents warping and cracking without the need for water or complicated setups, making it an essential accessory for musicians seeking to preserve tone and longevity.

Have a Question? See What Others Asked

Whats the difference between the large and smal kits? Which should I use for a guitar?

What does this actually come with? large photo shows two double-sided sleeves and four packets, but the description only mentions half as much.

How do they work for instruments that hand and are not stored in the case?

For an acoustic guitar in a hard case, would i put in one pack at a time? two? four? why two sleeves?

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