[https://www.amazon.com/Boveda-Double-Sleeve-Humidity-Instruments-Cracking/dp/B08M2HZV57/ref=sr_1_21?crid=2CZL3GHXNH2JA&keywords=boveda&qid=1642863362&sprefix=boveda%2Caps%2C129&sr=8-21](Here are the empty pouches)
(and here are the humidity pouches)[https://www.amazon.com/Boveda-2-Way-Humidity-Control-Humidification/dp/B00FEZNXP0/ref=sr_1_10?keywords=boveda+72&qid=1642863470&sprefix=boveda%2Caps%2C117&sr=8-10]
I wasn't happy with the little dehumidifiers you Velcro to the case. It would dry up too quickly and didn't really hold well against the case anyway.
So, for my best ukes, I chose the same stuff used to climate control cigars, Boveda. The company makes dehumidifier packs specifically for wooden music instruments. They're not as cheap as the small dehumidifiers, but I haven't regretted my purchase in the last year.
You need two parts: * Fabric sleeves: https://www.amazon.com/dp/B08M2HZV57/ref=cm_sw_r_cp_apan_glt_fabc_VSVKRNB69Y507YHW3XK0?_encoding=UTF8&psc=1 * Pouches: https://www.amazon.com/dp/B01B6AHW3K/ref=cm_sw_r_cp_apan_glt_fabc_A98WQ7F71GYZDP039MEJ?_encoding=UTF8&psc=1