Awesome idea, not burly
Great top-loader for alpine trips. You can use it as a stuff sack in your approach pack and break it out for light is right summit attempts.
I've tried multi-purposing this pack and using it for long trad multi-pitch, but you have to be careful with it here. It performs only mediocre in this role. No chimneys and no hauling for sure. After a single route, the pack developed 2 small holes in the nylon where it had scraped against sandstone. I patched them and took it as a lesson to not overuse this pack.