I've used my Tom Bihn Brain Bag every day for the past ~20 years. https://www.tombihn.com/collections/backpacks/products/brain-bag?variant=31808802848831 https

I've used my Tom Bihn Brain Bag every day for the past ~20 years. https://www.tombihn.com/collections/backpacks/products/brain-bag?variant=31808802848831 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.