ill help only because I go to UTS
honestly... I think this is a hard question
you can really just take nothing and live on the edge, or you can go OTT (which I do)
But in my Camelbak I ALWAYS take:
a multitool (inbuilt chain breaker & co2 inflator head)
C02 canstier
4mm allen key
5mm allen key (multitool cant always reach every bolts)
1x pair of surgical gloves (incase someone gets fucked/blooded)
3x tyre levers
1x tube
hand pump
2x gels
2x big and small cable ties
glasses case with safety goggles (clear and/or polarised)
Patch kit
schrader-->presta valve adaptor
KMC missing link
3x small packets of salt (from maccas...... had a few incidents with leeches when riding... so never ride without salt now, also good if you cramp up and need emergency salt !!!!)
and if im going bush bush... I'll take the 1st Aid kit (stolen from my old car)
things I/others can also have include:
knife, scissors, magnesium tablets (if you're prone to cramping), matches/lighter, spare extra bolts... ie 2x 18mm M6's.
Also heard of stories of chainring bolts failing on a ride... so maybe include 4 chainring bolts (figured cable ties can hold chain ring bolts in place long enough to get back to car)
Mirror if you get yourself seriously stranded, and DONT FORGET A WHISTLE !
thats the best i can think of at 1am... will add more as it comes to me ! Good luck !
note: love the fact my multitool has a build in Co2 inflator, chain breaker is a nice addition too!
Id love to see a knife or scissors on there, 8mm allen would be awesome. A pedal wrench might be too much of an ask given it needs to be 15mm (but I'm just throwing ideas at you)
My Multitool has:
3,4,5,6,mm allen key
philips and flat head screw driver
chain breaker
co2 inflator
nipple wrench
theres some bits I dont even know what the use it... I can only assume one of them is a missinglink/power link joiner/splitter,
So as you can see.... Yes I'm seriously OCD
But if you ride with me, you'll be safe and covered