Manual

Soulbound Equipment
Many of the most powerful items and equipment in the game are soulbound.
Soulbound items cannot be traded to other players. They can be sold to a vendor,
stored in the bank, or destroyed. You cannot auction off a soulbound item at an
auction house. If an item is soulbound, then it will say so just under the item’s name
in its info box. Items have different conditions for becoming soulbound. These
options are as follows:
Bind on acquire: This item is bound to you as soon as you pick it up from a
corpse or quest giver. Most quest rewards bind on pickup.
Bind on equip: This item is bound as soon as you place it in an equipment slot.
Once it is equipped, the item is soulbound and cannot trade hands again. Most
good items that are made through trade skills bind on equip.
Bind on use: This item is bound as soon as you use it. Such items are generally
not able to be equipped but have an effect that you use directly from your
inventory. Most items that summon mounts are bind on use.
Quest items: Quest items are a special category of soulbound item. If you are
looking for items in order to fulfill a quest, these items often have the quest
item tag where the soulbound tag usually appears. Items with the quest item
tag cannot be traded to other players or sold to NPC vendors.