AhyKa Aerodynamic Water Bottle Set 600ml Big Capacity Food Grade PP5 Bottle With Ultralight Carbon Bottle Cage Bike Accessories

If you want a more traditional Elite Chrono style TT bottle, I've got an original Elite, and an AliEx clone that works using magnets, and I prefer the AliEx version. The cage on the Elite never worked that well - the magnet is a bit bulkier on the AliEx bottle but an easier process to slot back in the cage. They don't hold very much, and really only integrate well with the down tube meaning they look a bit off when using two, so I think they are more suitable for TTs where you are more interested in using the bottle as a fairing rather than drinking very much out of it.