On a long run, water bottle, energy gel (not always used but there just in case), tissues, phone and MP3 player and back door key. On short runs I don't take the phone or gel. I've found that now I'm used to running with a waist pack I hardly notice it's there. I've never actually needed the phone while out but I always take it for the one day that I'm somewhere rural miles from anywhere and I sprain an ankle etc - and then I will be very thankful for it!!