I am hiking the first 40 miles of the AT with some friends. We wil be hiking late March, through early April. I am not sure what the temperatures are going to be but I suspect 40-50 but likely 30 at the lowest. The plan is to leave Florida early Thursday and get on the trail late afternoon/early evening.

The first year I went my pack weighed 55lbs due to my lack of experience, and because my friend who had done it before. It was rough. I did a longer hike the following year on the next section at 30lbs. I expect to be under 30lb this year but I need to plan accordingly. I am an average temp sleeper. I have a HH Backpacker and a JRB Nest...

Would I be able to manage with just a liner such as this one?
http://www.rei.com/product/797114/se...ummy-bag-liner