I've looked at the BC50 pack and though I think it is very well made, I have a problem with the hydration bladder design. I can't find any way to protect the water bladder during use. It is completely exposed to any items that I put in the main compartment of the pack where the bladder hangs. It does not offer an option to prevent it from being punctured (like a secured 200 denier flap or plastic flap). Also, the bladder is too long for the main compartment alone. There is a zippered divider that can be opened at the bottom of the main compartment to allow the bladder to hang down completely. However, that flap also serves as the divider between the main compartment and a smaller chamber just below the main compartment. So, if I use the bladder and let it hang down completely, which you have to do if you want the suction port to be at the lowest position for proper water flow, I lose the use of that lower chamber. Zippering up that flap forces the bladder to be folded back on itself at the bottom, which won't work. So, it's either live with the real possibility of puncturing the bladder, design your own protection flap, or don't use the bladder at all. I have a CamelBak with a 3 liter bladder and was looking to replace it with a larger, stronger pack. This unit is definitely stronger. I thought this was the one, but because I require internal hydration storage and I wouldn't want to deal with a punctured water bladder, I will probably never use this unit.