Most I have seen have a sheath that only covers the blade. Wearing it, then, leaves the whole handle not contained. If it isn't pushed well down in the hose it can easily flip out. I bought one some years ago without a sheath so I made one that went up half the handle. It coincidentally fits others that I have. I put that sheath down to where the top is at the top of my hose. I have not had one fall out since I have used this one.