That blackburn cage is an interesting idea.
I sure thought so, but promptly broke 3 of them at the weld joins within one ride on logging roads. Mine may have been the exception, as all the broken welds were only tacked on one side, so incomplete. Promptly warrantied by the dealer, but would have been inconvenient on a longer ride.
Took care to make sure the bottle fit the contours and to keep the straps reasonably tight. Nicely finished and a versatile design; I may give them another go but will test first.
Best,
Dan.