Product review (5 stars): Keeps Reeds in "ready to go" condition.
Purchased Rico cases for my son and daughter. They play alto sax and clarinet. We live in Arizona where the humidity can get down to as low as 2% which can dry out, warp and damage reeds. During the Monsoon season it can get really humid.  We have both extremes here, but mostly low humidity.

The 73% RH packet keeps the reeds in "nearly" ready to play condition. Just a few seconds in his lips and its ready to go.

Currently my son is using Rico Royal reeds and my daughter uses Vandoren and Rico Select reeds.

The price is comparable to local music stores, but no sales tax. If I were just buying one, I'd buy it locally because the shipping costs. The pack comes sealed in a paper-foil package like those hand wipes you sometimes get at restaurants, so you can buy several and store them until its needed.

I bought the replacement pack because we would be needing it and to get free shipping (I was short a few bucks).