I don't think I've gone more than a month without carrying a backpack since Grade2 - inclusive of vacations, college (2yrs), and various places of employment in A/P, A/R, or I.T. all requiring a laptop and every year weighing 10lbs or more! I'm not exaggerating in the least in any way!! Saving 3-7lbs isn't much when you're using a backpack vs a side/saddlebag. And knapsacks like Timbuk2/Crumpler makes them a LOT more comfortable to use.
School (Elementary, K12, and College)
Work (18yrs)
Jiu-Jitsu (1yr)
usually walking more than 800meters in 1 or both direction for each ... several times walking 50kilometres just because I stayed out late past running transit hours. Maybe it's because I've always been fit, never driven a car for very long (heavy right foot led to a few years of suspension and too afraid I still have that foot and may kill someone), and well just cannot allow myself for being lazy and taking my own too legs for granted. I'm not super big or strong but my legs I enjoy and since track & field I still manage 4sets10 x 185lbs, maxing out 225lbs for 6reps in proper form for Deadlifts, 450lbs x 10reps max for Leg Press. I don't even work out every 2 days yet getting more consistent by the week. I'm 44yrs old ... how old are you or what's your excuse for handling a few pounds variance of 10lbs in a knapsack (weight suspended over 2 shoulders)? Sorry I stand by my original post.
You're still in college and if you're fully "able" physically and not suffering from MS or similar degradation ... start getting in shape it'll help you for the many years of your life going forward and not worrying about 1-2lbs in a laptop in a knapsack. But I get you ... LOVE the 2013-current MBP and their style and size.
PS: Here in Toronto in Jiu-Jitsu, there is a guy under 30 who has MS, gets to 2hrs class every 3 days in a wheelchair adjusted car. Yet he REFUSES to receive help taking off his shoes, walking 7m to the stairs, going UP 30 steps of stairs, and then PUMMELS the arrogance out of just about everyone else on the matt ... ALL without his crutches! He's freaking incredible in skills and determination, and he's NOT lazy. He'll walk down those stairs as well. If I lost even 10% of control of my legs or mobility I'd seriously loose it. We're talking about 2lbs difference in a laptop on our back here ... consider his troubles.
Cheers.