The Traveler's Backpack is a 16 slot bag. It is similar to the Backpack that all newly created characters start off with. It ties with the Mooncloth Bag as the largest bag that does not bind (either when picked up or when used).
This item can also be received from the Arena Treasure Chest in the Gurubashi Arena.
Patch 1.3.0 (07-Mar-2005): 16-slot bags are now set to Uncommon.