I like the interior of the improved version a lot more, well done. I've been watching ur videos for a few years, glad that you end up making your own backpack. Personally, I mostly use a smaller backpacks like Aer Slim Pack and I recently switched to Able Carry Thirteen Daybag as my daily driver while my Aer City Pack collecting dust;) So I'd love to see you making a smaller version in the future!
I plan to use a lightweight, dust-resistant material called CORDURA RECOR! If I have a chance to make a high-end model, I would love to try the X-Pac model.
Also you can make external water bottle pocket longer similar to ALPHA ONE NINER, WHITLEY . Improvement: 2 mesh zippered pockets on the sides similar to ALPHA ONE NINER, PATHFINDER
Please stick with sample 1 design. On side water bottle pocket , please use it as an external zipper pocket and you can put water bottles inside to prevent bumping. Check axiom 24 design concept