I am all for preparedness, and I’ve gone through a multitude of hydration packs to find one that’s both comfortable and I can carry everything I “need” in (found the Osprey Zealot 16 pretty close to perfect), but these days I am all about sensible minimalism. Bought a pair of Specialized SWAT and Race Face Stash bib shorts with the pockets that go over the baggies. Brilliant kit. The setup is as follows:
On the bike:
1- One spare tube strapped to the top tube with a velcro compression strap used for camera tripods (£1 off eBay).
2- Two 25g CO2 canisters strapped to the bottom of the seattube with a Zefal CO2 holder.
3- One 610ml bottle in bottle cage
In bib shorts rear pockets (also works with roadie type jerseys with rear pockets. Must be fitted so that stuff doesn’t flop around):
1- Left rear pocket: Topeak Ratchet Rocket (by far my favorite tool) + small snack or energy gel.
2- Middle rear pocket: Another 610ml water bottle.
3- Right rear pocket: Small zipped pouch with micro CO2 inflator, tyre boots/patch kit, spare powerlinks, and Presta to Schrader adapter + a second spare tube.
Baggy shorts pockets:
1- Phone, £10 bill and cards inside a Timbuk2 Mission wallet.
2- Jellybeans in a ziplock bag in the other pocket.