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.

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.

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.

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.

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