In August 2008 I bought the Marware CEO Milano (see attached photos) for my 17-inch MacBookPro. Carrying the laptop AND the bag back and forth to work every day was doing horrible things to the vertebrate in my spine so in January 2009 I bought a MacBook Air.
The MBA fits in the bag very nicely with loads of space for portable hard drives, USB flash drives, power cables for iPhone, MBA, etc and a sandwich.
The CEO Milano itself is VERY light. When the bag is full it's easily 4 or 5 pounds lighter due to the smaller laptop. The bag is solidly made so the laptop is protected from drops; documents or document folders are not bent/wrinkled/dog eared like they were in my BrentHaven backpack (see attached photos).
I stopped using the backpack because it was too heavy. It also wasn't the best for carrying documents - they got mushed up easily. The backpack is easily 8 years old and looks like new - no apparent wear whatsoever!
The Marware bag is a year old; the only signs of wear are on the bottom (the part that rests on the floor when you lay it down); the leather is not torn or ripped at all - the wear marks are simply scuff marks, like on a pair of shoes. It comes with a shoulder strap - very robust and comfortable but I don't use it.
The CEO Milano has been successful in stopping a long-lived, almost unconscious habit: I no longer keep my eye open for a new, better bag; it suits my needs very well. I no longer ask people about their bags; Its a sad commentary on my life but I no longer have bag envy!
I recommend checking out James Kendrick's posts about the many bags he has tried in his long-term search for the best gear bag - a link to his site is below with other related links.
Good luck!
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Marware CEO Milano page:
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JKontheRun (search: bags)
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LitCentral 3-part article on bags