The MSR GearShed doubles the storage space of your tent. Designed to fit the Elixir 1, 2, 3 and Hubba NX, Hubba Hubba NX, Mutha Hubba NX tents.
MSR says:
The MSR Gear Shed adds 2.46 sq m (26.5 sq ft) of covered storage space to your tent, increasing its livability and giving you the versatility to make one tent do it all.
The MSR GearShed is a hooped vestibule that expands the storage space and weatherproof coverage of most Elixir and Hubba NX tents. A partial floor keeps your gear off the ground and the extra space gives you enough room to remove your wet gear before you climb inside your tent. It's great for storing packs, muddy boots, or for giving the dog a dry place to hang out.