I love this backpack. My cat comes everywhere with us and I don't feel like I am leaving him out since the dog is always with us. Had one for years and just wanted a new color so I purchased a new one. It is totally secure, just make sure the zippers are all the way down to one side or another because one time I met the zippers at the top and my cat was able to separate the two zippers. All the way down to one side or another and that has never happened. Have been using these for 6+ years. Totally recommend.