My Team Fortress 2 Inventory is gone!

I cannot view mine either. The Steam servers are playing up. It'll appear in time.

It's the invasion of inventory stealers from the outer space. They've come for our hats.

Its the first time that his happens.

If you're using outpost you'll see the following message "Sorry, but your backpack couldn't be loaded at this time — Could not retrieve data from Steam's servers." which confirms that steam servers are down or in maintenance.

Steam was under maintenance today and normally that means the item server goes down for a while. Just wait, your items are safe, is normal this kind of stuff happens.

Just wait. This ain't the first time I've gotten a problem with Steam, so that's all you can do.

My tf2 inventory is back. Thanks for your answers everyone.