Good morning, Kathryn, I really appreciate your input. I really am leaning towards the Active (tan w/ br. leather trim) Tote-o-Pet. I am trying to decide between the XS and the SM. It says the XS fits comfortably up to 4.5 lbs. possibly up the 6 lbs. The SM says comfortably up to 6 lbs. possibly up to 8-10 lbs. Gypsy weighs 4.5 lbs. so I'm thinking maybe the XS? She's not going to be left in it for hours at a time, we are travelling by car so it's mostly so that I can take her with me more places. What do you think?