Thermarest Prolite3 short mat - 14oz - The BPL torso-lite and/or the Montbell pad are 9.9 ounces and plenty comphy.
MSR Pocket Rocket- 3oz, Fuel canister 6oz - The canister stoves require heavy fuel canisters, alcohol is lighter for short trips. The options are cheap, compared to the heavy and expensive canisters.
REI titanium pot w/ lid- 5oz - 5 ounces? Use a tiny mug instead, much lighter.
Katydyn Hiker pro filter- 13oz - Wow, this is TOO heavy. Just get AQUA-MIRA and re-package it in smaller dropper bottles.
OR waterproof food bag- 4oz - 4 ounces? For a stuff sack? There are plenty of lighter options.
Platypus 1 liter bladder- 3oz - this seems wrong, a 1-liter bottle is lighter.