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A standard choice is a ULA ohm, circuit or whatever. Tough, light and good looking with a massive customer base and great reviews, and you can legit shave off 30-40% of the weight to get a 330g backpack by snipping extra webbing, unnecessary buckles, pack brains etc
Otherwise Gossamer Gear packs are a good balance between toughness, light weight, “snippability” (remove extra features) and looks.
An unorthodox option I went with was an Alpkit Gourdon in 30L, snipped extra webbing and toggles and removed the pleather sections to get it down to a very cool 240g for robust drysack with side pockets and straps (don’t need hip belts).
You might consider giving up on the dream of a completely waterproof bag and just use a packliner, will be cheaper, lighter (unless you go full cuben) and more available if it breaks
Atompacks UK
Palante packs
GramXpert EU
SWD
Appalachian packs
Aliexpress even makes some good ones in xpac and other mats
