I just took this bag with me for my international travel for work, which is very frequent. Had been using a standard luggage tote, but needed something more lightweight with more compartments.

Had the following requirements:
1) separate compartment for 15" laptop for easy in-out passing thru security (I use a laptop sleeve for protection)
2) separate compartment for travel necessities (lotions, food, sweater, sleep stuff, ipod, headphones, laptop stuff, eyeglasses, etc)
3) front pocket area for storage of smaller items that need quick access (travel docs, passport, wallet, cell)
4) straps needed to be long enough to go over my shoulder easily, even wearing a winter coat
5) something super lightweight and durable.

This bag fit the bill. There was a ton of extra space even without using the expanded section. After plane travel, I used it as my laptop bag during my trip.

The only drawbacks were:
1) Because material is so lightweight, it has no structure. When filled with stuff it's no problem, but if it's pretty empty it will fall over. No big deal for me because being lightweight was more critical. Actually, the lack of structure helps with underseat storage since it's not a rigid shape and can conform as needed.
2) The yellow straps make this look kind of like a gym bag. Would have loved them to be all black to look more professional, but again not a big deal for me.
3) The yellow straps can also be unclipped and hooked together to create one long strap, but its not adjustable - bag falls down past my hip when I do this since I'm short. No big deal since the double strap option is just the right length for me anyway.

Overall the the bag met my needs at an great price point. Seems pretty durable. Could have bought something more expensive but this works.