If you want premium features such as lightweight, collapsible and incredibly strong you do have to spend a fair amount of money for a well built and chew proof crate. This could be seen as a worthwhile investment especially as the life of your dog last many years (hopefully). If you are willing to make a few sacrifices and your dog is not exceptionally strong or aggressive then some cheaper heavy-duty dog crate alternatives will perform the same job.
Overview: This is an extra large dog crate with soft sides. It is usable for both indoor and outdoor use and it also is waterproof, so you can take it camping with you (it looks like something you’d take camping). There is a storage case included with purchase and it folds down into that case conveniently. The measurements are 48 x 32 x 38.5 inches and the crate itself comes in other sizes for smaller animals as well (this is their XXL). The entries are front, side, and top.
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.
Most Helpful review (read the full Amazon review): “I needed to know how much this weighed and one listing stated it was 48.8 Lbs I'm not very trusting of website descriptions so I weighed myself and then held the kennel (not easy) and the difference was 43.7. Also to make this airline approved you need to buy metal nuts for the bolts instead of the plastic ones that come with it. You might also need to drill holes in the rear. This is plenty big for my 95 Lb lab mix. He fit in an XL but…“
Addendum added January 28, 2013: My vet had never noticed these carriers because I had never put one up on the exam table until my last vet visit. She looked at it with interest and totally concurred with my opinion of having a small, but open carrier for my two (panicky) cats. She has seen more than a few overheated pets in too enclosed carriers. Since I live far from the vet I always carry spare towels for the bottoms of the carriers and she found that the "stable floor covering'* I use was an additional comfort feature for my pets long trip to their appointments. (I just ordered the larger size of this carrier for my "Phat Kat" and will donate her previous carrier to our local animal shelter.)