My dog loves this carrier. I was using a more rectangular shaped carrier before ordering this one. That worked ok but with this carrier he can sit up comfortably and he can look out through the little window. I use the clip on the inside for safety and when I have this carrier on my back, I do not have to worry about him jumping out. The measurements meet the Frontier Airlines requirements for under the seat.
I like that the sides expand so when I am working in a shared office space, he has room to move around or stretch out for a nap.
It does get a little heavy and I considered buying one with wheels but then that can cause an issue with being over the size for flying. This carrier has the chest strap and waist strap for humans so I close those and it helps with weight distribution. Well, I close the waist strap because the chest strap makes my chest look weird.
Last thing, because it is a backpack (as opposed to a stroller) my man does not mind carrying it when he is with us.
Overall, great purchase!