I went on a 5 day vacation with my family and remembered everything...except my practice mute!! I realized it as soon as I unpacked my pocket trumpet, and promptly had an anxiety attack. We were a few hours away from home, so I had no choice but to make something myself.
There's a YouTube video with instructions for a Renuzit mute, but I didn't have all of the supplies, so I improvised with duct tape. I'll have to admit that I was a bit skeptical at first, but I was pleasantly surprised when I tried it. There was a bit more back pressure than I'm used to, but overall it did a great job allowing me to practice without disturbing/waking up my family.
Just wanted to share..