Why would a samurai go to mainland Asia? To buy a pot, of course! Asia's full of potters making all kinds of cool traditional pots and jars. The samurai probably wants to take them back home and show them off to his pot-loving samurai buddies.

Specifically, this samurai wants to buy a pot big enough to hold two bodies (つぼ). Why? Well, samurai have a lot of enemies. I wouldn't pry into it too much — you might end up as one of the two bodies inside the pot.