Re: Backpacking - Essentials while carrying light

5 think we should get specific here in order to give any further assistance.  Precisely how heavy is heavy?  What is the weight of your loaded pack and what are the contents?

I  also think we need to focus on your pack.  A typical backpack, suitable for overnight trips, has at least 55 liters capacity, plenty enough for a suitable sleeping bag and all other necessary items.

A temperature swing from 90 to 50 degrees is actually rather benign; especially at elevation, the daily swing is much greater, often dipping to freezing or below.