First thoughts,

I question the inclusion of a Leatherman in this kit. I love the LM but if you are in the wilderness and this is your only kit, most of the tools are not very useful since you don't have anything to fix. For wilderness use a fixed blade knife will allow you to do more than the folding blade.

I also think you need to include something to carry all the stuff in when you fill the bottle with water.

Since fire is one of the highest priorities, a second device is a good idea, particularly if you choose a Bic for the primary. The Bic is very reliable, but they do fail.

I would use a bivi bag or blanket (AMK or similar) instead of a garbage bag. The reflective capability is great if you have a fire.

I too would recommend a flashlight with larger batteries. A light with AA or AAA would provide much better capabilities at little increase in volume or weight. I also would go for a headlamp.

Where you might be out, I highly agree with Alex that bug wipes or a headnet would be critical.

Respectfully,

Jerry