Camping and outdoor equipment
The Robens Air Impact Single 3.8 Sleeping Mat is seriously light at the price, and makes the difference between a good night's sleep and, well, no night's sleep.
There are, I know, a lot of hardcore bare-bones tourers among you who will assert that sleeping mats and the like are an unnecessary luxury and dead weight when bike camping. I would disagree. Find a compact, lightweight sleeping mat and it can make all the difference.
For non-winter bike camping adventures, a lightweight down sleeping bag like the Robens Lite 300 can be a good compromise, offering more warmth for its weight and size than a bag with synthetic insulation.
A super light but reliable stove is a must for bike camping, the Express Ti from Primus offers a long manufacturer's pedigree and the desirability of a lightweight titanium build, so certainly demands consideration.