I've in mine:
Passport, drivers licence, uni ID card, bank card, insurance card (as in NHS), discount card for an outdoor shop

, Medlook card (medical data), 10 & 20 Euro note, 5.34 Euro in coins

, lubricated condom (you never know when you need a water carrier), A4 paper with confirmation of my uni exam enrolment, copy card to make copies from notes my fellow students made for when I skipped a class
In my jacket I carry a small flashlight, public transport card (free travelling trough the whole country

- big thank you to the dutch government :You_Rock_ :yikes:

), orange whistle, another water carrier

, some sweets, a lighter, bic pen, swiss army knife, keys and my mobile phone.