I was going to make a post about my back pack. I have had it about 2 years now and it is still in the same condition as when I bought it. It has been to America, Switzerland, Gibraltar and soon Australia. It is actually a DJ rucksack designed by Brandon Block (DJ). It has a compartment for a laptop, space for pens, passport and other stuff like ID's (passes to get into datacentres). In my pen slots I keep a couple SFP modules. Inside where the laptop goes there is an interior light so that I can find what I am looking for like cables and stuff when I'm stuck in the not so well lit comms room.
There is also space for a DJ mixer, but I keep my Cisco Press reading material in there. There are side pockets which are actually very large. Large enough for a drink, food, or in my case, rack nuts / bolts, screw driver and analogue telephone (the cheap tiny one from Ebay)

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The straps are very very wide, and the carry handle is covered in thick foam.
Take a look, I have the black one: (I actually paid £50 for it, but it's half price now!)
http://www.amazon.co.uk/BLOXBOX-RUCKSAC ... B0019ALZ40http://www.htfr.com/p/257845/bloxbox_dj ... headphoneshttp://www.planet21group.com/bloxbox/I forgot to mention that all compartments are padded so no worries about the laptop, router or ASA you're lugging around getting broke. My last Targus bag wasnt padded that way and even though the straps were wide to begin with, they easily squashed and became thin.
Meanwhile, back in the city...