Item sharing

As a rule, items in Dota 2 cannot be shared with other Heroes. The purchasing Hero is considered the owner of the item and only he can use, sell, or upgrade it. However, since consumables cannot be upgraded into other items and only grant temporary effects, they can be freely used by all other Heroes. This is important, since it means that support Heroes can purchase Sentry Wards or other consumables on a Courier and other Heroes can place them.

Other permanent but inexpensive items that grant regenerative abilities are considered partially shareable. This means that other heroes can pick them up and benefit from the effect of the item, but cannot sell or upgrade the item. Divine Rapier is also partially shareable because of its unique mechanic.

Finally, certain items have disabled abilities when placed on the Animal Courier, to prevent abuse.

Partially shareable items
Bottles filled with runes are not shareable (see August 5, 2011 Patch Notes). However, partially filled and filled bottles are still partially shareable.

Completely unsharable items

 * All recipes
 * Every item that requires a recipe except Flying Courier
 * Every item not noted above

Items disabled on Courier

 * due to Dominate
 * due to Unholy Strength
 * due to Arctic Blast
 * due to True Sight
 * due to Transmute

Note that Flying Couriers are also unable to pickup the Aegis of the Immortal.