Tarptent - upper left ad, you can use a regular pole instead of trekking poles. I use a contrail. Mountain laurel designs also sells tarps and CF poles.

what are you carrying water in?

I usually carry an extra pair of socks and body glide.

I don't know how tall you are but that thermarest has to be a small size. I'm trying a reg NeoAir for a 3 day AT run this weekend.

others will chime in about carrying 2 bics instead of the matches and a regular toothbrush with the handle cut off instead of the wisp.

add extra rope and a 'biner to hang food or just about anything.

I also carry deet wipes, single use packets of sunblock, a leatherman squirt, and a bandanna or a packable towel.