I am thinking about getting a Mamajamba when I order my BB to use on my upcoming appalachian trail thru hike. What I want to know is will it give me enough coverage that I won't need to use an under cover. I really do now want my underquilt to get wet and it is going to be raining and wet all the time so I need to be sure I am covered! I just have never seen a Mamajamba set up in person so I don't know how well they cover. I would really appreciate some guidance!!