Did you know that a Snappi has a limited lifetime? Having only started using them recently to fasten our prefolds and snapless fitted diapers, I knew how to use one, and knew to s-t-r-e-t-c-h it before use to get best results. I was vaguely aware to keep it out of UV light, which could damage it. I didn't pay much attention to the rest of the packaging when I opened my first one. I ordered a second one just in case my first "walked off" but kept it in storage until recently.
About 5 1/2 months after I started using it, it seemed to be "giving up" on me...and I started using the diaper pins again as it would pop off as I tried to pull the wool cover over the diaper. As I'd need to stretch it from almost her back hip to back hip to get it to grab, I began to think "This seems longer than I remember. How would this work for a newborn? It's a size one - it would have to start in the back on an itty bitty baby!".
I pulled out the new one and started using it with much better results. When I got a chance to compare the two side-by-side later that day, this is what I saw. The top one had been in use for 5 1/2 months, and we'd *used* it! The bottom one has been used 2-3 times in this picture.
*Then* I read the packaging, which states that the Snappi is intended for use for six months. So there you have it!