Ada might feel happier in Snoozer Rollaround. It works as a backpack, and also has wheels. It has 2 mesh “windows” that you can open. Fluffy likes to look through them.

See:
http://www.flickr.com/photos/bubli/3381853196/in/set-72157615217651604/

You can stroll around with it like this:
http://www.flickr.com/photos/bubli/3381827678/in/set-72157615217651604/
(the photo shows it with opened “windows”)

Backpacking:
http://www.flickr.com/photos/bubli/3419884495/in/set-72157615217651604/

And on the floor, you can lay it down flat allowing the pup to stretch and sleep:
http://www.flickr.com/photos/bubli/3492389720/in/set-72157615217651604/

It is also airplane approved (the “medium” size)… Fluffy flew to San Diego and to Europe in it:
http://www.flickr.com/photos/bubli/3502692295/in/set-72157615217651604/

Petra