I foster small dogs for a rescue and have purchased 2-3 other brands them with my favorite, this Pet Crate.  I have the 24"x18" size and keep one in the back of my Rav4 for transporting to/from vets and adoption events.  These crates are light and easy to move around as needed and are good for general use.  They aren't for dogs who will bite or dig to try to escape.  You will need a crate with a heavier gauge wire for that.  For pet safety, if you have a small dog or pup, please make sure they won't try to put their head between the wires or through the bottom where the tray pulls out.