I'd suggest a large crate like lv4dogs linked to.
Adele had the same problem of escaping from everything- one time when we were out for a while (about 6 hours, more than she was used to being left alone) she broke out of her wire crate that is simlar to Jack's and required stitches which alone cost way more than her new crate. I'd say, if he has to be crated, get him a new crate, because he might get hurt otherwise. Good luck!

Edit: I just wanted to add that Adele (aka Eldini) has never escaped from her new crate, so that kind might work for Jack, too.