Ive had three fitted to mine for some time, and as i keep getting people asking me how the fook i did it, i guessed it must be a goodish idea. When fitting the two normal side pouches don't zip up the zips facing the front face of the bergan (where that little mess tin sized pouch is). Take a 3rd side pouch and zip it to these unused zips. Extend the male/female buckle on the long strap on the bottom of the side pouch to its full length and clip it to the loop at the bottom of the bergen. At the top of the side pouch fasten the male/female clips used to attach to a day yoke together to form a loop and then thread the male part of the lid closing buckle on the main bergen through this. Voila. I found this particularly good for carrying a radio around in, as the old 352/Clansman fits in there very nicely. you DO lose access to that small pouch on the front of the bergen, but what the effing hell use was it anyway? I posted this because i was told it was a good idea that people might find useful. If im telling anyone to suck eggs, then sorry!