On the back of the serrated blade of the Leatherman Charge TTI is a cutting hook. You'd need to be careful with the serrated blade and what it was running across as you used the hook to cut a seatbelt, but there it is. A dedicated strap cutter is nice but a full size multi-tool is hard to misplace inside a small kit. I've got the Charge TTI -- Ti handle, S30V knife, lots of useful stuff -- nice tool.