Is it possible to completely remove the frame?
Cheers, Michael.
do you mean the GS patrol sack shown above? if so yes
it was designed that way, so 1 frame can serve several functions i.e.:
frame plus GS patrol sack
frame plus SAS/Para Bergen
frame plus Radio.
perhaps the frame on it's own to carry munitions, water, medical kit etc etc.
I've also heard them being used as a sort of emergency stretcher (you strap a wounded soldier to it in a seated position, I think you'd end up being a casualty after carrying that though!) Life and death situations only!