Why We Recommend It: The Zinger Winger DX5000 is probably the toughest and most durable crate I've reviewed. I wouldn't call any crate 100% inescapable, but the aircraft-grade aluminum and stainless steel slam latches mean the DX5000 is a match for almost any dog. It's also lightweight (compared to other heavy duty models) and has lots of ventilation - the only downside is the price.
Why it's at #1? I chose to put Midwest Solution Series “Ginormus” Double Door Dog Crate as the first product on this list of best extra large dog crates because we found that it was actually the largest and easiest to clean. Also, the crates are stackable, which is something you don’t find with many crates today. All in all, this is a convenient, safe product for your dog.
Update: We traveled quite a bit this holiday season and this portable crate was absolutely awesome! I have seen some reviews about bad zippers but suspect it's due to misuse. You have to raise each side before zipping it -- just common sense, people. Otherwise, there is too much pressure on the zipper. I think zippers on this crate are sturdy. Another suggestion is placing your dog's favorite bed inside. The crate (we have extra large) has plenty of room to add an extra large fluffy dog bed our dog loves. Because the crate folds flat, we place the crate in the cargo area and cover it with dog's bed when on the road. The dog sprawls like a queen! :) When we get to the destination, we unfold the crate, throw the bed inside, and voila -- cozy house that ... full review