International travel with 8 year old 11 pound chihuahua. First, I want to say that I appreciate the styling of this bag. It is an attractive carrier and has a smart design. There are veiled mesh openings on each end of the bag, on the top of the bag and on one side of the bag. These allow for my pup to feel like he is hidden while providing good air flow opportunities. At one point my dog scratched at the mesh (he wanted out from long flight) but it did not rip - seems to be made well. The top of the bag has a zipper on both sides. At the end of the zipper there is a strong velcro closer plus a strong clip closure. Teafco has gone to a lot of work to make sure your dog is unable to open the carrier. So, if you zip it all the way, connect the velcro pieces and clip it shut, your pet should not be able to escape. Plus, there is a short tether line inside the bag that can be clipped to the pet's collar so he can't jump out and run when you open the carrier. I'm very happy with my purchase!