
just use some X-loop's and start strapping them on you can put as many as you like on front and back 
http://planeteclipse.com/site/prodView.asp?prodID=334
They also fit on all packs well all i have tried any way
but for £2 you cany go wrong 
http://planeteclipse.com/site/prodView.asp?prodID=334
They also fit on all packs well all i have tried any way