Re: quality sleeping bag
Having a good sleeping bag is critical if you want to stay comfortable and sleep well. Firstly, given that my locale is in the great white north, we do things to the extreme from a sleeping bag perspective however the principles are the same. Here are some points to consider:
1. Layers. Purchase two sleeping bags in a progressively colder rating. If it is very warm, you use the lightest, slightly colder; use the other and double up for the coldest conditions. Allows you to pack accordingly and not haul dead weight. It also gives you the widest range of coverage.
2. Bivy Bag. I consider this a must have. I use a issue goretex bivy bag as the outer layer. Keeps moisture out, provides another layer to your sleeping bag set up and in a snap, keeps you dry if it rains or the tent leaks.
3. Head cover. When it starts getting cold, your breath because a problem because of moisture. If you sleep with your head inside your sleeping bag, you will wake up wet. You need to keep your face ie nose and mouth outside the bag. Consider purchasing a balaclava that is designed with a long shoulder area vice stopping at the base of your neck. This will keep your head warm, and allow you to seal off the sleeping back around your head and neck in a mummy bag. A great deal of heat is lost as you move around in the bag and pump warm air out via the top of the sleeping bag. Organize yourself so you are comfortable, your head/neck is warm, your face is outside the bag and you have sealed off the bag to stop air escaping. This step alone can mean the difference from a warm comfy night...to being cold and uncomfortable.
4. Sleeping pad. Often overlooked. Getting a proper pad is essential, it keeps you from loosing heat through the ground. When I am in the high arctic, I have a close cell pad on the ground, and put my thermarest pad inside my bivy bag so that I can not roll off of it.
5. Sleeping bag material. Our issue bag here up north is down. It works great in the arctic...but once it is wet, it is useless. I was on exchange in the UK in November and spent the most miserable exercise of my life in the field. I was wet from the beginning of the ex until the end. After that, I purchased a synthetic bag and never looked back.
I personally use Wiggy's bags and well as snugpak and arktis light weigh bags. Both of these UK companies have outstanding lighter bags designed for jungle or wet conditions. They also have reinforcements in the feet for use with all your clothes on. I have never done that in North America but have in the UK and Afghanistan.
I hope this helps a bit.
Cheers
Jeff