This is the perfect pack for any work in progress. 10x13 size means that you can put patterns and books in there, along with your yarn, needles and accessories. I have one of these for every project I have ongoing, and then I put the whole thing in my regular knitting bag. (I finally gave up on zip-top plastic bags. Too many holes poked in it from my needles and scissors. These are a much better replacement.)
Zipper top. Helps keep you organized and able to see at a glance what you have "in-progress".
(Contents shown for scale and not included in the price.)