Man, i love my walt johnson! it's hella strong, and way compact, and really has plenty of sotage(although i did get a cavalero cover and neck pouch) just to give you an idea, here's what i have in my case now:
2 boxes of reeds
a wrench(for key adjustments)
obviously the sax.
i'm also using the covers pouch to store 2 more boxes of reeds, a reed case, swabs, drumsticks, pens/pencils, and a lyre