Kenda Super Lite Tube
Kenda produces basic, reliable, inexpensive tubes, in a huge assortment of sizes. Kenda Super Lite Tube are available for MTN, or Road. High quality Presta valve road tube with .73mm wall thickness rather than the standard .87mm thickness for less rotational weight.
Its Kenda, for the price...the best.
As their name say, these are super light tubes. The only problem they have is that they puncture easily. So if you need something light for a competition, these are definitely the tubes you need, but if you need them for everyday riding or training, I would probably take a spare tube with me just in case.