Looks like Luna gave her carrier "two paws up"!!
What kind of bag and where did you find it! I bought Toto one for the flight up to Colorado and made sure I had it well in advance. I just casually put it on the den floor with the top and the front unzipped ... just let her sniff it for a few days. Then I would put a treat in the back of it or a favorite toy ... anything that she would go in there to retrieve. Gradually I would put her favorite blankie in there and told her to "kennel up" like we do when we are going out. I would close the front and take her on short trips ... across the street to Granny's house, to the mailbox, etc. Before I knew it ... when she would see me getting dressed to go out she would run and get in the carrier and wait for me!!
We leave it sitting somewhere on the floor with the front unzipped and it has become her little refuge!! She runs to it as her "safe place" when she has been naughty and sits in there peeping out at us!! We always remove her from the front and although we leave the top unzipped, it's as if she doesn't realize that she can get out that way ... she always comes and goes through the front!!