You can but eventually it gets pretty damn annoying, better than the standard design though. I bought one for use in Afghanistan in conjunction with my body armor, I had hoped that it might have a flat enough profile to wear under my kit..... No such luck.

As far as Camelbak only carry is concerned..... great if you are spending a day at the range. Lots of guys went without for a few hours after having the bladders burst upon impact while performing that good PLF.

John

Fisrt line and second line means what exactly?

1st line being what you have on your person, essentially what's on your belt and in your pockets, etc, and 2nd line is what you need to fight and sustain for a short period...vests, chest harness, whatnot.

Thanks.