Items are purchased from shops found on the map. Items may be sold back to shopkeepers for a 100% refund within 10 seconds of purchasing. After that period is over, or if the item's ability is used, the item can only be sold back for 50% of the original price. Consumable items like Tango and Infused Raindrop have a sell value is based on their number of charges remaining. A few special items cannot be dropped or sold.
The Inventory has 6 slots and holds items being used by the hero. Items must be in the inventory to be active and provide their effects. If the inventory is full, items will go into the backpack instead.
The Backpack has 3 slots and holds inactive items which provide no effect. Items in your backpack remain inactive for 6 seconds after being moved out of the backpack. Items can be moved out of the backpack with no inactivity timer when near a shop. Backpack items take twice as long to cooldown. Items that drop on death cannot be put into the backpack.
If away from a shop, any items bought will go into the Stash instead. The stash has 6 slots and is accessible from either fountain. If the inventory, backpack, and stash are all full, any further purchased items will be dropped on the ground at your team's fountain spawn area.
The total number of items that can be dropped on the ground by a player is 24. The number of split items (tangos/wards) allowed on the ground is 6 per player. Items that drop on death will drop normally without issue even if the limit has been reached.
Heroes generally cannot use items purchased by other heroes. Some consumables and a few other exceptions are shareable.
Items can be disassembled within 10 seconds of being combined. After that period is over, only a few items retain the ability to be disassembled at any time.