People have been complaining about not having enough inventory space for a long while now, and the devs haven't really shown extreme promise towards updating inventory space directly. But what about, instead of upgrading your inventory space...we can use saddle bags for our horses? I am thinking 25-50 slots for one horse, basic horses getting 25, upgraded or premium horses getting 50. It could be accessed via your character sheet, much like Artificer/Druid dogs. Perhaps give a warning that it cannot be accessed during quests, so people don't put vital questing items in there. I think it could solve the inventory issue, at least for now.