Where are going?
When?
Weather expected?
Length of trip?


-GPS, on a well marked tril is probably not going to be needed
-What is the weather going to be like for your trip, no bivy?
-Umbrella, nix. You have a rain-jacket.

-There are lighter stoves
-There are lighter pots
-Can opener, seriously? What the hell are you backpacking in? Consider different food choices and nix this.
-Nalgene bottle for soaking what? Nix.
-Sierra cup. You could eat and drink out of your pot.

-You have a lot of water storage: Camelbak, 10L bucket, 32oz and 16oz Nalgene. In most places 2L is plenty. Consider pairing this down.

-How long is this section hike?
-Are these clothes all packed to start or are some worm when you start?

-Consider nixing the spare underwear
-Consider nixing one pair of merino socks. One to wear and one in the pack is fine
-Any reason that you need the shorts with converible pants? Consider nixing one.
-Flip-flops can easily go.
-Are the rain pants necessary? Most hiking pants and running shorts dry quickly. If they are needed, then I would imagine that a bivy is needed too!

-Bug repellent and sunscreen, this can be repacked into 1oz bottles from REI.
-10L bucket, what for? Consider nixing.
-Flashlight, consider a headlamp.

-Signal mirror can go
-Spare batteries, how long is your hike, do you need these? Put fresh batteries in before you leave.

-Dr. Bs and Purell. Nix one and repackage.
-TP is a personal choice, you can go without.
-Is there a need for both a washcloth and towel
-Sewing kit. Generally there is nothing that duct-tape won't fix.

I am not going to comment on the food.