I bought this bag to use for carrying small knitting projects (eg socks or a hat) while travelling. It's absolutely perfect for the job. There is just enough space for a standard 100g ball or cake of yarn, plus all the essentials like tape measure, mini scissors and stitch markers. I have since discovered many other day-to-day uses for the bag, like taking my phone, keys and sunglasses to and from the gym. I'm considering buying the larger size for travel essentials like book and headphones,