Many of the places I enjoy going on my solo trips are high in the Sierra Nevada Mountains and I enjoy trips in the spring and fall when there are fewer folks around than in the middle of the Summer. As such I regularly experience night time temperatures that are beyond chilly and approaching downright cold and because the weather can change rapidly at high elevations it's always a good idea to be prepared for more weather than the bimbo on the 7-o-clock news has predicted.
I stumbled on a bag that suits my use case perfectly. The Kelty Coromell is a down bag that comes in a slightly roomier shape than the standard "mummy" type bags that are usually found for this temperature range. It's a +0 deg down bag which is, quite frankly, warm enough for anything I'll be doing with a little extra warmth for unexpected weather, but the best part is the "semi-rectangular" shape. It provides the warmth and pack-ability of a down bag and a little extra wiggle room in case I want to...wiggle. The hood is removable if need be and has drawstrings to tighten the hood. There are two neck baffles with drawstrings (top/bottom), a full-length zipper and a chest pocket to stash your watch or flashlight for easy retrieval in a dark tent.
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