I have a larger camping-type backpack that I never use; I can fit 35 pounds of gear into the Brain Bag... although a sleeping bag takes up too much space. Haven't solved that yet.
But a fully loaded Brain Bag usually fits fine as a carry-on bag for airline travel.
https://www.tombihn.com/collections/backpacks/products/brain...
I have a larger camping-type backpack that I never use; I can fit 35 pounds of gear into the Brain Bag... although a sleeping bag takes up too much space. Haven't solved that yet.
But a fully loaded Brain Bag usually fits fine as a carry-on bag for airline travel.