I prefer a PD10 (single CR123 battery 2.9"x.75") myself over the 2 skinny AAA batteries of the LD05 (5.9"x.55") even though the AAA batteries are cheaper and more readily available.

Personally, I am salivating over the new TK35 (4 CR123 batteries, 820 lumens!, 333m throw) At 6.5"x1.7" it is still small enough to fit into a jacket pocket or pants cargo pocket or its belt holster.

BTW, I'm not really sure why wearing a flashlight would be considered a no-no when every bloke has a cell phone holster anyway or you are carrying a barely visible pocket clip knife. JMHO.