Favorite for sure!!
This allows you to have the best possible coffee on the trail. I fill mine about 1/3 to half full with coarse grounds (or even right from the grocery store) of my favorite coffee...I drop it in my Snow Peak 450 mug and slowly pour in the hot water over the grounds. I let it sit a minute and badabing I got coffee as good as I can buy anywhere. A quick light rinse after emptying the grounds and it's clean. Personally, with the advent of starbucks via packets, I was afraid I might have wasted my money on this...but soon realized it just flat makes better "real" coffee- hands down. It will ALWAYS go in my pack. Oh yeah, and you can totally use this even off trail when in a hurry- microwave some water drop it in and you're off to the races. It has never fallen into my SP450...fyi. Fits perfect.