These cages weigh in at 30 grams, and so far have proven to be quite strong, given the fact that they are extremely lightweight. Some of our early test cages were in the 18-22 gram range but the bottles weren’t always secure. Arundel’s main design parameter was to choose a design that was not only light and durable, but would prevent the bottles from “ejecting” out of the cage, since there is nothing more frustrating than losing contact with the bunch just to retrieve an errant water bottle.