I just use cheap generic bags (Regal, I think). We buy a half-dozen every now and then and give them away to anyone who buys a laptop. I use the same bags myself. No protection to speak of other than the thickish cloth they are made off (you know, the usual canvas-like stuff with a bit of stiffish foam plastic or something inside and a softer lining) but that is plenty for me. It doesn't get carried around anywhere except the eternal round of home - car - office - car - home - car - bush - car - more bush - car - home - car - office ...... so that level of protection is fine.
They have a couple of document-size slots which I rarely use, room for a texta pen to mark backup DVDs with, and a pocket big enough for trackball and AC/DC power adaptor.
The other stuff I need for trips travels in a dedicated carry bag, a big black canvass thing: a 50 stack of backup media, pre-stamped envelopes to post the backups home in, four bird field guides, some other field guides (mammals, reptiles, fish, a couple of flora ones), half a dozen novels, a similar number of other books (whatever non-fiction I happen to be reading at the time), assorted battery chargers for things I don't use all that often (the main ones are plugged into the car inverter all the time), spare flash card reader, spare camera, soap in a plastic bag, bug repellant, sunscreen, some spare change for emergencies and because I can't be bothered cleaning out the electronics bag too often.
I can pack for a trip of arbitary length in around ten minutes flat. Most of that is making trips out to the car and back carrying the various bags, which are (nearly) always pre-packed and ready to go.
If I'm going to be away for longer than three weeks, I need to remember to take the electric clippers, or else stop at a town somewhere and get a haircut.
There.
Is that sufficient detail for you all?