I would guess that a 2xAA with a clicky switch would probably be the handiest form factor for this kind of stuff. A twist light would seem to get old if you're going to be using it several times nightly, and 2xAA would be easier to find if you happened to drop it in the dark. Or is a 2xAA not "pocket sized" enough?I guess one question would be...do you need to be able to use it with gloves on? A lot of clickies are recessed, and would be hard to push on with gloves. The "tactical" style lights usually have a protruding switch...I *think* the iTp SA2's tail switch sticks out past the end, but I don't have one to check. A Quark AA2 Tactical would probably fit the bill, if you can find one used.