I found out about the k9Sportsack when I was on an airline flight. The woman seated next to me had her small dog in one. I asked her a few questions and I was convinced this was the solution I was looking for. I have a 4-lb. Chihuahua that is somewhat disabled. I also have a puppy that is bigger and playful. I often have to carry the small girl but that leaves me with only one hand to work with. I bought the extra small Trainer with the foam block and they couldn’t work better! I wear the sack in the front because I’m at home and my little girl likes snuggling into my neck and chin. She loves it. I love it and I can’t thank K9 Sportsack enough for providing this wonderful solution that makes everyone happy!