The Ratio Arc EVA: Hard-shell Waterproof Laptop Backpack

Light weight and very comfortable design. You cant feel the weight when you wear it as backpack

Solid construction, well thought out storage pockets, and comfortable to carry. Would highly recommend this product.

the good and not so good

The backpack is cool. Great look and feel. It has nice pockets and accessories. The not so good is that the inside is quite small and there is no method to expand the bag. It is really only suitable for office/school use, even carrying stuff for the gym would be difficult unless that is your only use (i.e. gym+office would be difficult). Any attempt to put shoes or clothes in the backpack will quickly overload the space unless you have very small items. This is largely because the backpack has a very thin profile. They should make an expandable version so it could be used for overnighters, going to gym after work, etc.