They have two variants of their side-clicky 18650 lights. The SC63 and SC600 MK3. The SC63 will be less bulky with very thin side walls and a smaller reflector. Maximum output is the same as the SC600, however it PID will kick in sooner because there's less thermal mass to them.
The SC600 MK3 is equally as short, but there's more thickness to them and a slightly larger reflector. PID will kick in a little later with these.
I've carried both the SC62D and SC600 MK3 HI in my jeans pocket, and I don't have any issues with them.