AhyKa Bicycle 600ml Aerodynamic Water Bottle Bracket Set Bike Water Bottle MTB Road Bike Frame Down Tube Riding Water Kettle

I must have gotten lucky with my set. Perfect fitment and 0 leaks. I don't have to over tighten. I can shake bottle upside down and no leaks. Even a light squeeze removing the bottle when full doesn't squirt out. The flow of water is comparable to my old specialized bottles I have

OK, so here's my review of those. Weights are 86g for bottle and 44g for cage (no bolts).

Pros:

• well-designed cages, have plenty of position adjustment so will fit any frame. They seem to be designed for round bottles in mind too, but it's not a snug fit (tried tacx and 2 elites). You can put a round bottle in there, but my guess is you'd lose it on a first pot hole.
• super smooth to get the aero bottle in and out. So smooth that it worries me a bit, but so far no problem
• no rattle, at least until you reach a really crappy tarmac - there I heard some rattle.

Meh:

• always open nozzle design (squeeze the bottle and it goes). Not my preference, it works fine... until it doesn't.

Cons: - the usual aero bottle pita: doesn't stay upright, has small opening so I have to make my mix in another bottle. I could get used to both. - more important, sadly another usual aero bottle problem: designers focused so much on bottles being aero that they failed at primary goal of any bottle: holding water in. The front bottle (the one at an angle) starts leaking as soon as fluid level is higher than the cap. With the bottle already being smaller than my usual, not being able to fill it 100% is a deal-breaker for me. Also, seeing my gorgeous frame all sticky just pisses me off

All in all, I'm guessing this review would've been 100% the same for Trek RSL bottles too. I've never owned them, but the design is identical. Would love to hear especially if Trek ones leak too. Personally, I'll most likely go back to battle-tested Elites and keep these for special occasions.