Option 1 - Seat post rack with panniers (either top mounted or side panniers)
- You MUST have an aluminium seat post to a seat post rack (a carbon seat post may crack under the load)
- The following topeak rack is a good choice: http://www.evanscycles.com/products/topeak/rx-quick-release-beam-rack-ec005992 BUT make sure that you get the right size for your frame!!
- There are several pannier options which fit with this rack
Option 2 - Light rucksack
Alternatively you can use a small rucksack, but bear in mind the following:
- best to use a rucksack that has "webbing" or a frame to ensure that the rucksack is not against your back (prevents sweaty backs!)
- select a rucksack that has side pockets and ideally straps so that you can attach items to the outside
- make sure you have waterproof covers, just in case....
20L should be sufficient for a daysack, something like this one: http://www.evanscycles.com/products/deuter/bike-one-20-ec032261
Option 3 - Full pannier rack
ONLY works with touring frames which have eyelets (at the intersect between the chain and rear stays) to accept a full pannier rack
Racing road bikes do not have these, hence only Option 1 & 2 is viable for most people
Option 4 - A Karri|
The "super light" option: www.getkarri.com