You've got a really good kit here!



You cannot hoof enough food to last 400 miles! So plan your bag for a shorter time horizon, somewhere in the neighborhood of three days. Can you carry three days' worth?



Are these chlorine dioxide tablets? They're my suggestion for disinfection -- purification would include removing chemical contaminants, where disinfection kills organisms that might make you sick.



Do these use LEDs? I strongly recommend lithium batteries, not alkalines.



Practice with these! Add a lighter -- It's hard to have too many methods of starting a fire.

Your first aid supplies seem to be lacking OTC meds. I'd suggest aspirin, ibuprofen, something for digestive upset, Benadryl, and a decongestant at a minimum.



Bring the gun that you shoot the best!

Also, consider that a .22 is not ideal for hunting larger game or for defense. Something in 5.56 might provide a wider spectrum of applications.



A tent of a useful size can be hard to lug around. A sportsmans emergency blanket (like this one http://www.amazon.com/MPI-Weather-Emerge...rtsmans+blanket) or similar could make for an easier way to carry something with you that you could use to build a shelter. Make sure to have Heatsheets with you for warmth as well.



Like fire-making methods and bandaids, it's hard to have too many knives.

A method to charge your cellphone. I prefer something that uses AA batteries as (with lithium cells) they last the longest in storage.

A radio capable of picking up local stations and NWS weather radio.

Some way to cut branches and the like. Most wire saws are pretty awful, consider a pruning saw or similar.

Contractor bags

A compact gun cleaning kit

Paper and pen

Small pry bar (like a Countycomm widgy bar)

Duct tape

Small camping stove -- an Esbit stove stores practically forever and is inexpensive

Sunscreen

Bug spray