>>2836406
Seek Outside probably make the best lightweight external frames and large volume bags. Never used one, but they have a good reputation as far as I know.

Savotta from Finland make modern, but traditional sturdy frames. Used by Finnish military. I have one and they're great. Pic related.

You can find other modern frames, often without bags, of various quality if you look around on google. Usually targeted to hunters.

You can buy waterproof dry bags of various durability and sizes. Just strap it to the frame.
Hightech is mostly a meme. External frames doesn't need all that crap as long as they have well designed shoulder straps and waist belt that sit ferm and comfortable.
Many people seems to use ultralight shit like Hyperlite made with hightech materials like dyneema.