Like many others my kit has been stable for years, so my favorite gear “of 2015” is probably the same as for 2014, 2013, etc. The criteria above is for gear that always seems to make it into your pack over and over, so…
I’d have to say my solo shelter system, which generically is a 2P mid with a bivy. Specifically I use an MLD DuoMid and SuperLight bivy but there are many excellent alternatives. I find the 1P mids to be uncomfortable collections of compromises whereas a 2P mid is a palace for one for only trivially more weight. The bivy is my groundsheet and bug protection and is also handy when cowboy camping, which is what I usually end up doing anyway.
I’ll include my cook system, though it did change slightly a few years ago. I believe that a wide (as opposed to tall) pot on the order of 1L is the One Pot To Rule Them All. It’s large enough to make a multi-course meal for one yet can cover two in a pinch. Mine is the uncoated 0.9L Evernew ECA252. I have yet to meet a nonstick coating that didn’t flake off very rapidly and avoid them, though I admit that I have no experience with the new thin ceramics. I’m nonetheless inherently suspicious of them and I’ve always been able to remove any burned-on crud with a handfull of sand and some elbow grease at any rate. I used to use a Ti-Tri Caldera Cone for it’s multifuel possibilities but made a SuperCat during a simplification phase I went through and have been favoring that. I’ll probably switch between the two as needed.
I spent a very uncomfortable night several years ago when I was unable to make tinder for a fire in some unexpectedly miserable conditions using the tiny blade on my Leatherman Squirt. Since then I have carried a full-sized fixed-blade knife as a “luxury item.” Mine is usually a MoraKniv Companion for the sake of keeping the weight and cost down while retaining full functionality. The Moras lack a full tang, though, and I’d like to find something similar that has one.
My other “luxury item” is a Klymit X Pillow. What can I say? I’m getting old. :)
After decades of wearing minimalist nylon hiking pants I finally put some stretch Prana Zion pants on my Christmas list, and my wife delivered. I have high hopes for them. I have only used them once on a dayhike in the Tortolita Mountains but they were quite comfortable.