Boveda Humidifier MB49-70-20P Two-Way Humidity Control, 20-pack of 70g to maintain 49% RH - 20 pcs

This two-way humidity control pack absorbs or releases moisture to keep it at the desired level. Contains 20 humidifier sachets.

What this product is: Boveda Two-Way Humidity Control sachets are designed for instrument cases and storage, automatically adding or absorbing moisture to maintain a stable environment. This bulk Mastercase pack includes 20 x 70g sachets calibrated to 49% relative humidity (RH) – an ideal level for protecting wooden musical instruments from drying, warping and cracking.

Key features:

• Two-way humidity control: releases moisture when the case is too dry and absorbs excess moisture when it’s too humid.
• 49% RH target: maintains a stable 49% relative humidity for safe storage of wooden instruments.
• 70g Standard size: fits classic Boveda fabric holders used in guitar, violin, cello and woodwind cases.
• MB (Mastercase/Bulk) packaging: sachets are stored together in one resealable plastic bag (not individually wrapped) – practical for workshops and frequent use.
• 20-pack (20P): includes exactly 20 sachets.
• Typical lifespan: around 2–3 months per sachet in a closed case (depending on conditions).

Who it’s for: Ideal for luthiers, repair shops, music schools, collectors and any player who stores instruments in a case and wants reliable humidity protection. Especially recommended for acoustic guitars, violins, cellos and wooden woodwind instruments.

Best suited to: Any playing style or genre – from classical and jazz to folk, rock and studio work – because stable humidity helps keep wooden instruments consistent, comfortable to play and less prone to seasonal damage.