Strong crate suggestions

So Adonis has had slight separation anxiety since we first brought him home. When I moved to my apartment it got worse and has slowly started to get better. I bought him a crate and on the second day he managed to break out of the front door. I then turned that door towards a wall and was using the side door until he completely destroyed it while I was gone. Now I either come home to him asleep in my bed and nothing wrong, or he's destroyed something or eaten something he shouldn't have. Yesterday he managed to drag the container holding 30 lbs of dog food out of my closet and eat until he threw up behind my bed :eek:. Exercise is my best option but some weeks, like this one, just don't allow me enough time to take him out for long enough. I've been looking for crates that'll hold up to him but everything I've seen is so expensive so I was wondering if any of you guys knew of a crate that wouldn't cost me an arm and a leg (considering I'm on a college student budget). Also what are some less time consuming ways to exercise him, I'm working on getting him back into shape, he's lost a lot of definition since we've been here.





I wish the top was a before picture but it's not :(

Strong crate suggestions