I keep on having to restrain myself from going "bigger and better" -- I already have my main backpack -- so the trick is to find something that will hold just the things I need (iPad, headphones, book, a magazine or two, ...)
The one I picked up is really the perfect size -- and you can's fault the price -- but I have to admit that I do like the one from ThinkGeek also...
The bag you got looks like a smaller version of one I have that is classed as an Israeli Paratrooper bag. Mine is big enough that I can fit my laptop (in a padded sleeve)along with assorted power cables, headphones, books, magazines, clipboard etc.
Probably bigger than what you want though and now that I've seen the one you have, I'm going to have to look for one. It looks to be just the right size for the netbook and assorted stuff...
While you are adding velcro, you may want to add some to hold the front flap down. I've found the snaps to be less than friendly.
One editor I know had such a large, unneeded collection of bags from shows that he gave them all to a homeless shelter, then over the next few weeks he saw presumably homeless people walking around in the area with bags with show logos—so they were put to good use.
That's not a bad idea -- I could add Velcro straps
FYI it was quite some time before I realized that my main backpack had Velcro patches on the bottom to help it stay standing upright when you place it on a carpeted floor...
I don't know of a bag, but what I would like is something like you found, but with (velcro?) straps on the side so that it could be attached vertically to the pillar of the seat in front of you. That way it is not under your feet, yet still accessible and meets the rules of stuff being under the seat at takeoff.
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