I am seriously thinking of making a set of DIY panniers that are nice,CHEAP(if ever stolen not a big loss)and lockable,but as I have a fairly light nimble commuter I want to keep weight as low as possible ie;the DIY panniers are a bit heavy.So am now leaning towards some store bought panniers...SO what do you usually do as far as keeping them,and everything inside from getting stolen? Take the panniers in w/you at the store,etc or lock them up somehow???or something else all together?