I have two KB Alex bags (putty and gold) and LOVE them. I've owned them for about... 2 years now and have used them several times a week. Unfortunately, the zipper on the gold one broke recently and the strap on the putty one is peeling

 I am pretty sad, but will most likely be buying another soon.  
Both my 5 lber and 7 lber ride snugly in my bags, so measure your pup to see what size you will need... What is most important is that they ride comfortably