Bulk Order Mailbox
Quest
Meet with Rothbert the Equipment Collection in the Tithing Chamber above Luna Bank. He will give you a quest, "A Short Shopping List" requiring you to craft or otherwise provide 1-3 of four different fairly common ML items (Ancient Wild Staff, Magekiller Assassin Spike, etc). Your reward will be a schematic.
Schematic
The schematic requires 75 Frostwood Boards, 100 Powder of Translocation, 1 Runic Hammer and 1 Runic Sewing Kit. To craft you must have at least 75 Carpentry. The BOD Mailbox created will have a "Crafted by" mark on it, and will be bound to the account of its creator. The account it's bound to is the one it will do link and player authorization checks on (eg if someone other than one of the creator's characters on any linked account opens it, it won't fetch BODs, but they can still view the contents assuming they have proper housing permissions to do so).
Bulk Order Mailbox
When locked down or secured, the crafter of this box can open it to find the BODs from all elligible characters on all linked accounts magically transported to the box. That means no more lengthy BOD runs or complicated login scripts to get your BODs. Open the box, sort through your "mail", and you're done.