[JohnBooty]

    I got a free backpack with my new Thinkpad laptop recently. 
    It's light, well designed, mass produced, easy to personalize 
    - would take this over the 450$ school bags any time of the year. 

Just to be clear: you're using your freebie bag to carry a laptop and not 6kg/13lb of schoolbooks, correct?

Something tells me the answer is "yes" which kind of makes me wonder why you're mentioning it

Do you also drive around in a compact car and think "man this is so much better than a school bus" and pat yourself on the back every time you see a school bus

[wraptile]

I'm confused how is that relevant what's being carried in it? in fact the flexible synthethic backpack molds much better to variable-sized objects you'd put in it rather than giant square leather bucket.

[JohnBooty]

You... don't understand how carrying heavier, bulkier loads will cause more stress on a bag?

[nephanth]

Weight pulls on seams and fabric, and since they're likely to cut costs on something they give away for free, carrying a high weight would probably shortening its lifespan