It's not the most exciting bag we've ever clapped eyes on, but this 'Sia' pouch from Marc by Marc Jacobs will pay dividends in usefulness and unintrusive style.
The bag is currently on sale at Jules B with a rather tempting reduction, so if you're looking for something to take on your festival adventures that's a bit more exciting than the usual camping shop fare, this may be a good bet.
Speaking as someone who has often had to pick up a small, lightweight bag for practical purposes at the last minute, I would certainly prefer to have this stylish little cross-body at the ready to help me travel in style. Camera, phone and cards - it's the right size to tuck them all away safely.
£73 (was £104) at Jules B