This morning, ESO unveiled some new assistants who will become available via the Crown Store in the upcoming March 31st patch. While not cheap, these new summonable NPCs will provide great value during your adventures.
Tythis Andromo the Banker
Will allow for storage of items and gold directly into your personal bank.
Nuzhimeh the Merchant
Mobile vendor for unloading the useless items collected in the field.
At 5,000 Crowns (roughly $36.00US) these assistants will not be an inexpensive addition to your repertoire, but since both will be usable by your entire group, there is a good chance that your wealthier friends may provide the access should RMT be beyond your means.