I want to gain experience making sleeping bags, etc. My conundrum is that I already own a gazillion of bags and such.
My initial thought was to make a series of 30-40*F degree bags, since I could get the practice of making the bags while using less down (and less money!). But I've already got something like 4 bags in that range. Also have a 0*F and -40*F. Eventually I'll make a better winter bag. Maybe a 10*F? Like I said, I don't really need them, but I want to get better at making them.
So, what sorts of bags should I make to be cost effective yet functional? Have others in my situation basically made bags for the cost of materials and beer for friends? And/or should I stick with my "original" plan and make a series of summer bags? Do I just bite the bullet, buy the down, and make a colder weather bag?