I have that exact one and I love it. The pockets are really big and it fits comfortable.
I am in love with the bag by itself, so I must say that



As far as my puppy. He is almost 4 months and he is almost 3lbs.I am a little concerned about the bag because I got the petite size and he has about 4 inches left of space. He is on track for being about 5-5.5lbs and I am just worried about the length and him being comfortable.
I love the bag though and I would just get a larger one once he grows out of it.
Hope that helps.