I think Starbucks VIA French Roast is the best compromise out there. It's as darn close to the real thing as you're going to get, it's lightweight, it's easy to brew, and there are no leftover grounds to deal with.
On a side note, I like my coffee to stay hot enough I can drink it at my leisure, but I hate the weight of a thermal mug. GSI sells a thermal mug that weighs in at 3.2 oz. I had a slightly lighter one, but it leaked all the time and the GSI is solid. VIA and GSI have elevated my backcountry coffee experience to something I look forward to every morning.