Blackburn Comp Water Bottle Cage $4.95
It's funny that something so small and inexpensive can responsibly take care of the most important thing you bring on your ride: water. The Blackburn Comp Water Bottle Cage is small, lightweight, and inexpensive, but it does everything you could want it to do -- short of pedaling the bike.
What community has to say
Jim Blackburn started out in 1977 in Santa Cruz CA making aluminum bike racks and soon thereafter his classic aluminum bottle cages. They still have not been surpassed (though often copied).
These are timeless.
Classic design, strong yet light, unbreakable, affordable.
I've bought Blackburn cages several times over the years and they're always solid and dependable.