Bicycle Emergency Tool Kits
Every cyclist should be able to facilitate a roadside repair for themselves or others for any number of common roadside scenarios. At the very least - change a punctured tube and repair a snapped chain.
Along with acquiring these basic skills every cyclist should equip themselves with the basic tools necessary for themselves or other passers by to assist them:
Tool caddy (bottle cage style are far easier to look after and use)
Two inner tubes (one in tool pouch and one in rear pocket perhaps)
CO2 inflator & 3 x gas bottles
Fit for purpose multi-tool (either with chain breaker or without)
Chain tool if not on multi-tool
Chain quick-link (appropriate to your chains speed)
Tyre boot (can use trimmed piece of old tyre wall if necessary)
Self sticking puncture repair kit (just in case)
Rubber gloves
Length of gear cable with nipple to replace snapped gear cable (to allow a single selected gear to be chosen in case of snapped cable)
Multi size spoke key
Tweezers to remove thorns
Cable ties (for any number of fix-it jobs)
The above items form part of a basic on-the-bike tool kit which can be tailored to suit an individuals needs and style of riding / type of bike etc. Gas bottles are my personal choice of inflator respectably if group riding, however, a pump may still be chosen to be carried by those less experienced cyclists.