My caving pack is a Lost Creek product. It is very well built and quite substantial. It has served me well for many underground trips.

BUT - it would not be my first choice for a pack I was going to carry in an above ground environment. There are many packs just as sturdy, far more comfortable, and that will shift less on your back as you scramble or climb. Underground, the ability to carry a bag on your back, over your shoulder, etc., makes real sense because you are often changing as you go through the cave. Above ground, I prefer a properly padded pack that sits tight on my back as I cruise. At the end of the day I feel a lot better...