i personally find the GGTB to be the sleekest of all
mods. (yes. sleeker than the GGTS. if james bond had a pv, this would be it). it is not a 5v
mod however. 3.7, 6v, or 7.4v.
there is a 5v version of the GLV. there are others that escape me at the moment.
also, by barbell do you mean "flashlight"? the reason behind most mods taking the shape of a box or tube is not form, it is more necessity. it is rather difficult to put a long lasting high power battery is a small cigarette like form. but me personally, i will not use a cigarette shaped PV. when i quit smoking and started
vaping, i wanted nothing to remind me of the habit.