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I'm very much of the opinion that narrower is better on anything but Fatbikes.
The bag is still going to bulge even with a narrow spine. Central partitions help with the bulging though.
There seems to be a trend to make bikepacking luggage bigger and bigger lately, and it means people are taking more stuff than they probably need, simply because they're no longer having to think so carefully about what they take.
Just my opinion though.
Any design tips for a custom Alpkit framebag? looking to carry a hydration bladder rather than bottles. It's a big frame so should be plenty of storage space. Best to go as narrow as possible (4cm) to avoid rubbing?