https://custombikexcessories.com/products

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80/20 Endurance Ambassador

Thank you for the link but these are custom boxes. Made for 1 frame in 1 size. And quite expensive.
I am looking for a universal one that is frame independent and cheaper.

You mean something like an xlab aero pouch?

As far as I know, the answer to your question is no. Too many different frame shapes, seatpost shapes, etc etc for a universal one. Everything is custom or model specific.

I think the best attempt to answer your question is a storage pod/bottle mounted behind the saddle.

This is correct, I wish I could make a one box fits all bikes, then I could sell them much cheaper. But alas, every tt/tri bike frame is different and so are their seat posts. A storage box that could fit on the back of a seatpost, would likely not work because of varying seat post heights and would not be secure enough to keep from moving around.

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http://www.custombikexcessories.com
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Sounds like a great business idea...

E

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Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting

“You are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.”

something with a simple ratcheting mechanism could feel more sturdy and permanent than Velcro and would solve different depth aero seatposts