I COULD carry a simple old school band/case razor. I'm popping packing tape and lighter weight straps many many times throught my day. I carry my microtech (bronze/brown OTF in my picture a few posts above) for two reasons.
1. Well I'm a child of 51 and it's a cool knife.
2. One hand it's out, tape is cut and its closed and back in my pocket in about 1.58329 seconds. This is very handy in tight spaces like my walk in deep freezer. I can be supporting a box with my other hand. I won't stab myself in the leg trying to close it (lol) or set it down where it can fall into a tough place to get it back...
The other microtech, the orange one in the same Pic, is really thin, it stays clipped to my seat belt at the base. It's glass breaker is substantial, it's frigging bright orange, and it's very sharp. Again, single hand operation.