Trade Stash as additional Inventory

You've just farmed that bad ass Boss again and your inventory is bursting with all those purples. Your group is itching to get right back to farming again but you need to go the the Amazon and sell, right? Not to worry, R-click on the name of one of the members of your group (anybody close by will do) and then L-click Trade. Drag over those Unique items to the trade window (don't worry, you will not lose them as a Trade cannot be completed unless YOU hit Accept). Now hit cancel. Ta-da, your inventory is freed up and you can get right back to farming. Sell that Trade stash later, kick Boss butt now!

But please -- let the other player know what you are doing! It is very rude to use another player in this way without asking them first.