I always wondered how others do it too
Yeah basicaly i just carry around usefull stuff like for example 30 pieces of gear fo the diferent jobs im lvling atm, and som items and crafting stuff, it occupys aroung 50% of inventory leaving half for drops, at the end of the day i just dump everything on my 2 retainers, 1 for gear and 1 for every other type of item, and something always selling on the markets
But honestly it feels like a really messy system special if u wanna sell old gear and have to waste time repairing everyting, sometimes i just npc stuff and lose money -_-