I have a tech kit that I carry with me to all of my shows and gigs; I have tape, wrenches, testers, connectors, and a whole bunch of other stuff. I have been using regular old school backpacks, but I am looking to upgrade to a larger bag that can fit all of my stuff well. Does anyone have a trusted brand of backpacks for this purpose or a favorite bag they have been using? I would prefer one with space for a laptop, but I can do without if I have to. Thanks in advance!