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Unlike the Impact, the Zinger Winger no dog escape crate uses solid metal steel bars for its door. Dogs will often choose to attack the door, knowing it is both the way he gets in and out. It is important that it is tough and secure. This robust solution works well here. It has a quality locking mechanism. This one uses two flush-mounted slap latches to ensure a secure close. It also uses a full length piano hinge plus striker plate. Its design also allows for reversible door installation. So it’s great for left-handers as well as right-handers.
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