^it's not much bigger than many regular handbags sold today, you'd never need to worry about fitting it in a airplane baggage compartment. I don't think you could fit a few days' worth of clothes in there unless you were going somewhere very warm. If you go to this UK site they still have the measurements, it's only 18" long:
http://www.therubyredcompany.co.uk/product.php?productid=16315&cat=0&page=1
http://www.therubyredcompany.co.uk/product.php?productid=16315&cat=0&page=1