When I was in, I used the regular old web gear with 4 mag pouches, 2 canteens, and 2 compass pouches.
In mine I carried:
6 mags, 1 canteen cup, 1 stove
r. handside compass pouch-compass
r. handside ammo pouch-minimag, motrin/meds
l. handside ammo pouch-leatherman, BFA, small bottle of CLP, lighter, small medic scissors, tripwire, heat tab, cammie stick, electrical tape,
l. handside compass pouch-2 field dressings, eng. tape, vs-17 piece and a s. mirror.
I had the earplugs in my r. canteen pocket and my water pur tabs in my left canteen pocket.
I'm sure I'm forgetting something.
These days for my gear I carry all the above in a RACK or other chest rig, plus
small e-trex gps
surefire 6z (replaces minimag)
strobe
radio
sometimes also a talkabout
flares
chemlights
additional med gear
550 cord
misc e&e gear-space blanket,trashbags,etc.
spare batteries
folding saw
I add or subtract med gear/survival gear depending on what I am doing.
I have my pistol in a dropleg and my SRK on my belt.
Sometimes I'll add my leatherman and my surefire to my belt depending on what I am doing.
Just wanted to hear what some of the other folks carry in their second line. Always looking for new ideas.