Large make-up bag

Used the same tutorial from http://prettymodern.typepad.com/its_a_pretty_modern_life/2009/08/zippered-box-pouch-pattern-and-tutorial-fully-lined-with-photos.html

But with different dimensions: 16x14

I don't know how to make the bag sturdier except use thicker fabric.
But I'm obsessed with sewing with zippers right now :)