The carriers that are always on my bike include the Topeak saddle bag and handphone pouch. The handphone pouch mounted on the handlepost allows me to quickly check messages or answer calls while I'm on the road. Of course I will stop before I do that, but having the phone in front allows me to hear the phone when it rings.
If more capacity is needed on the bike, I will use my Dahon Tour Bag, which is mounted to the front of the frame. This is especially useful as its large size allows me to carry lots of stuff, such as more bottles of water, a change of clothes or other things. The bag is also waterproof, and can be detached from its mount easily. Also, the mount is attached to the frame itself, and not the handlepost, thus it does not affect the steering of the bike at all.
Inside of Dahon Tour Bag, with a bottle to show the scale. See how spacious it is!
Another new addition to the bike is a seatpost mounted bag. This comes with a quick release clamp, so that it can be easily removed or attached without tools. The bag is made of two halves that closes like a clam, and also comes with a waterproof cover.
Quick release clamp is secure and does not slip or rotate while in use.
With the additional capacity, it is now possible to go for extended touring trips, such as the upcoming Desaru trip. Although the total capacity of these carriers is still less than that of full-sized panniers and a rear rack, what I like about my bags is that they can all be detached easily when not in use. No tools or lots of time and effort are needed to put on or remove these bags. Compare the two pictures below: It takes less than 1 minute to remove all the bags from the bike, which is useful when I am not using the bags and want to keep the weight down.