Newcomers often ask questions about what crates to use for their dogs, consider the dog you are trying to contain when you examine the possibilities. To shop for crates on-line search through the shopping links at this site. A suitcase wire crate is safe for the dog, and safe for those around it if it chooses to try and escape. They collapse into a compact size that is easier to carry, but they are heavy. If items should fall on a wire crate the dog inside will not be affected, save the noise it may make.
General Cage crates fold down quite easily and nicely.
Some soft-sided crates are easy to breakdown into compact sizes for ease of travel, but dogs can and do escape from these. Some chew their way out creating costly repairs. There is a large variety of this type of crate available from the Sherpa or Samsonite crate approved for Airline travel to the Cabana crate. They provide comfort to the crate trained dog and ease of transport to their owners. If the dog is a jumper or climber tops can be purchased that will fit over the X-pen preventing escape.