Please raise your hand if you're sick of me talking about my flashlight. Okay, everyone can lower their hands now. Last time...I promise.
I found this velcro strap lying around and decide to see how it worked at holding the light on the back of my hand. It's awesome. I found that when carrying a handheld bottle in one hand and the light in the other, I struggled a bit when it came time to fiddle with other things (zipper, gel, bio break, etc). The picture makes it appear bulky & uncomfortable, but it's not at all. It also helps my arm to keep a more natural running motion while the light stays focused on the trail.
I'm really glad I figured this out now while I still have a lot of dark running ahead of me.
Another thing I learned last weekend...to fill my bottles with hot water when heading out for a long run with temps in the low 20's. I filled up both handhelds with two scoops of EFS powder and hot water. Heading out the door at 5:00 am, I carried one bottle while having the other stashed in my empty hydration pack. At first it felt a little funny to have heat in my hand, but it took a good hour in the frigid temps for it to cool down (at which point the bottle was almost empty). When I took the second bottle out about 1:45 into the run, it was still hot. This may not work for everyone, but the warm grape drink was actually pretty tasty.