Honestly, I think the (just guessing) 18350 'grenade' one is pretty much going to disappear into your palm unless you have tiny hands, with just the clearo visible. Unless you have it sitting on a desk or table, I can't imagine anyone noticing.
Personally, I like the controls/size of that one vs. something like a Vamo in 18350 mode, where the controller doubles the size of the
mod by being bigger than the battery.