Vortex defender flip cap - Vortex Defender Flip-Cap Lens Cover

I got the small size flip cap for the 40mm eye end of my Mk4 Leupold. The soft sleeve that goes over the tube is a bit loose. Still seems water tight, but I added a black wire tie to hold the cap securely in place. Also on my 700 bolt action the bolt catches the cap on the way back. Perhaps this is intended to open the cap? It does open the cap when you pull the bolt back. I also got the dope disk. Very helpful aid to have at the ready, but get the large print as difficult for old eyes. Overall a plus and will protect the scope.