I've been using an old backpack for a camping bag and I think it's time to trade it in for a bag that's built for the outdoor life. An actual camping bag is a specific design.
It's longer and more durable to be able to fit clothing, food, water, supplies and anything else you can get into it. It's perfect for backpacking or just regular hiking, too. I'll be using mine for hiking and camping. My friends and I often park and then hike to a camp site, making us feel a bit more secluded.
Camping bags are designed with air flow in mind, unlike a regular backpack that definitely makes you sweat in all the wrong places. I've looked at several different types and while I'm usually hesitant to go for something that's "for a woman", those bags really are more designed for how our bodies are shaped.
I also really like how camping bags fit around your waist with a belted clip harness. When I tried some on in the store, it was nice to feel secure with it on me.
I would definitely recommend going to a store and trying a few one to make sure it fits you right.
I camped in Lake Tahoe on a soul-searching journey last spring, and there was a surprise snowfall. It was April, so I wasn't prepared for sub-zero temperatures. I drove there and spent a miserable night shivering.