Stretto Holder DIY

A Stretto is a partially perforated plastic humidification device that holds a small envelope of gel that you saturate with water from time to time and keep in an instrument case. It sticks to the inside of the case by way of velcro, and some cases have material that the velcro hooks can stick to. My violin case does not have that kind of lining, so I have to figure out an alternative way of securing my Stretto.