what are the dimensions of the main...
what are the dimensions of the main compartment? would this fit a 15" laptop? is there a sleeve?
No way a 15" laptop fits in here. There's no sleeve and the pack is designed for sidecountry skiing.
Take a look at the Osprey Quasar. It's what you need.
I have fit my 15" MacBook Pro inside of it with room for a 3 subject binder to spare and my MacBook has a protective case on it so it makes it a little bigger. Definitely a tight fit, but it is doable, I have the M/L size.