So you are looking for a large garden shed with room for all your things? This FAMIROSA Galvanized Steel Garden Shed is worth a look. It measures 101.2″ x 389.8″ x 71.3″ (W x D x H) and 4 vents (9.1 x 3.9″ each). It is designed to withstand corrosion.
This shed takes a couple of hours to put together by 2 people. It comes with pre-cut and drilled pieces. You can find out more about it here.