It's actually quite roomy! I managed to fit my Tory Burch wallet, a Kindle Paperwhite with leather cover, phone, iPod touch, portable charger and some makeup.
Here's my small Hayden. I'm able to fit my Neda wallet, LeSport Sac makeup bag, OK pouch, 2 iPhone 6's (the one in the pic and the one I took the pic with)
Here's a pic of the contents when I was using my Longchamp bag (minus the coffee tumbler)