I have tried every bag, pet carrier, backpack out there and this, by far, is the BEST! Harley (@ruffandroll) has no problems getting into the bag and he absolutely loved it. He is 6 lbs and 12 years old and slowing down....within 10 minutes of our walk he wants to be picked up which is hard for me because I have another dog that needs to be walked as well. Yes, 6 lbs can become heavy when going on long walks. This backpack is heaven sent! I just put him in and he just sits there and watches the world go by. The product is very well made and I have absolutely no issues with the quality or him falling out. His little body is secure and safe. Thank you for such a great product!