Originally Posted by
Sierra_rider
I second the Elite cages, I've got them on a couple different bikes.
I have a set of these on one of the road bikes:
For the gravel bike, I have the "Cannibal XC" Elite cages. They load from the side/top and really hold the bottles well in bumpy terrain. I can even grab/put back a bottle in them when bouncy down some rocky fire road, without even looking.

I can see how the lower model could be loaded from the side, maybe not the upper.
There are times I fail to find the cage w/o looking when replacing the bottle--lacking Stevie Wonder skills on the go--and even then some are less fiddly than others. This is my current favorite, because who doesn't relish paying seventy bucks for a twelve-buck accessory?
Silca Securo Ti V2.