Over the years I've answered that question with: 'Whatever is handy'. Mostly I was wanting something that I could take with me for my travel knitting. For almost four years I've been using my Domino Gadget Bag which I used for practice knitting up those mitered squares designed by Vivian Hoxbro. I used remnants of sock yarn and added an attached I-cord binding and a red zipper - I love red! I discovered that the flannel lining that I used is perfect for storing my sewing-up needles, too.
As you can see, it isn't as tidy looking as it was for its first photo - taken before I actually used it. I've added the usual lozenge tin to hold all those
I love my gadget bag and I think it's very useful. Small enough to go in any of my bags and big enough to hold anything that I could possibly need while away from home. In fact, this is with me all the time. It's the home bag, too.
This is a blog hop, you can visit Madeleine and take a look at what other folks are using.