I dont have a hacker backpack, but if I did, this is what I would carry:
In the backpack:Laptop (with modem)
200+ mw WiFi Card
40+ gig hard drive (to ditch if needed) :-)
omni directional antenna
a "Cantenna"
Small WiFi router
second NIC
PDA with Wi-Fi (modified for use for the antanas)
cat5 cable (standerd and crossover)
Null modem cable
standard serial cable
phone cable
power adapters for all the equpment
batteries for all of the equpment
batteries modified to work with the routter
speaker to use on phones (software bluebox)
modified POTS phone
On the "fishing vest"Pliers
Screwdriver (plus, minus, and any other funky shapes you need)
PDA with Wi-Fi (modified for use for the antanas)
duct tape
electrical tape
wire cutters
any manuals you need (could copy them to the PDA)
thumb drive with the "package"
small USB NIC
Headphones for audio feedback/music (could create a bluetooth setup to look the the average joe that is talking on his phone)