I'm looking to purchase a camping sleeping bag. I'd like one that's high-quality, durable, and suitable for weekend hiking/camping trips during spring, summer, and fall in New England. (Most of my trips will be hiking with a backpack rather than driving to a campsite.) What factors should I consider when investing in a sleeping bag?
Given that the temperature varies so much in New England, what should I look for in terms of temperature rating?
Does having a camping pad underneath the sleeping bag affect what I
should look for in a sleeping bag?
What type of material should I look for?
Does the shape matter in terms of performance, or do some shapes just provide less bulk so they're easier to pack/carry?