Definitely bring gloves, and water. Lots of broken glass in the bins. You have to search for good things, and it’s going to take time to go through stuff. Wash your hands when you leave.
A new name for this place ought to be the farm (the way people are herded during new merchandise rollouts) or the citydump (there's moretrash than treasure here)
Want some real bargains? Go to the Goodwill Outlet Store, where everything is literally sold by the pound. Yep, you read that right. By the POUND. If you're ever going to get a deal, it's here.