Being a Grand Canyon hiker, I wanted a beefy pack that could take some serious abuse, silnylon makes me nervous for pack material.

I have two four night trips under my belt with my M Jensen pack and can say that the pack is as bomber as they come.

It carries well (25lb loads with water). The designer was famous for turning cartwheels with the pack on.

Here's a thread with plenty of pics
http://www.bplite.com/viewtopic.php?f=26&t=1061