It'll fit in most pockets but this thing is pretty thick, so you'll have a visible square bulge on your average jeans haha. It's about ~2.5x thicker than my phone when closed. It's just small enough to be pocketable but it's definitely more practical to carry it in bigger pockets or a jacket pocket.
That said, the new model (RG SP) is thinner than this one, so that one might be better. You might also like the Miyoo Mini Flip which is smaller overall.