well thought up
Since the mule has been out for so long and each generation getting better and better, I think this one is getting almost perfect. The shoulder strap had rings so when your loading the water they don't get in the way, the pack is very compressible or non to make way for more clothing. Much better than previous models where you had to yank the thing up and down to get the bladder in. Now you just zip it up and its good to go.