Have one what? A MacBook? or a bag? Well yea I could definitely recommend both
For the MacBook, what are you planning on doing with it? If you are doing things like watching videos, word processing, maybe a little picture editing (nothing serious) and web browsing, then any MacBook will get the job done.
The MacBook Airs are the smallest and lightest and the lowest spec'd overall, however they do have SSD drives (which I'm sure you can get in certain models of other Macs) but they fare pretty well with average day to day activities.
Since you dont' really have a computer at all though, I would suggest a macbook pro; they all have great specs and whatnot, and the reason that I didn't suggest a macbook is because an update to the line should be coming around the corner any time now.
For a laptop bag? Incase has some pretty good ones.... I like that overall look that they have; if you're into video games and know what MLG (Major League Gaming) is, Astro Gaming has a couple that are great quality; going to get one from them at the start of the summer.