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This, or at least make some non-stackable items stackable/more stackable. I get it doesn't make sense, but I tend to carry a few kegs of ale and a ton of camping supplies...
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I assume keeping the inventory limited during your travels and separating it from your bigger storage was a deliberate decision to emphasize the feeling of being limited in your options while travelling the countryside a little and force the player to manage their inventory instead of just picking up every single stone and mushroom.
But it does happen rather quickly that you hit the limits of what you can carry... Maybe it would be possible to buy an enchantment from Viv for extending Garth's storage and/or providing you with an item which lets you access the storage during your travels, or adding an NPC which carries a certain amount of items around... Something like that would be great.

