Hey guys... through REI dividend and sale, I got a screaming deal on the Aether 70. As I packed it for a prospective 4 day trip, where I won't be carrying a tent, I am barely packing 2/3rds.

Compression straps work great, and longer trips may warrant more space (tent, extra clothes, etc), I am wondering if exchanging for the 60L might be a better play.

I don't see myself ever doing a backpacking trip alone (gear split for lighter packs). The weight is negligible. I realize its always easier to cinch compression straps than add more space, but I am wondering if it would be more comfortable pack if I am only running with 40L of gear.

Any thoughts?

Thanks!
~grc