Looking for some advice on updating my gear. I have used a Kelty 65 external frame for the last 10 years. It's still in great shape and has always served me well.

I have minimal experience with internal frames but I know they have come a long way in the last 10 years. I am considering pic related(Deuter aircontact core 65+10). However, I was shocked to see it only weighs about 2.5 Oz less than the trekker. (5 lb 5 Oz vs. 5 lb 2.5 oz).

What advantages am I looking at with the internal if not weight? I know it looks a little more modern and sleek. I feel like the kelty sits really good on my hips and it's easy to strap all my shit on the outside. What other changes might I need to make to my gear to get everything in the pack?

Any advice appreciated.