Currently I have MEC panniers, but no handle bar bag or rear trunk. I find that one pannier is way to big for when just myself goes out for a boot. When my wife joins on the tandem, one panier is great, as she always overpacks : ) So as I am looking for a handlebar bag, I would like to get, or at least consider a trunk at the same time (to match). What are your experiences with Jandd, Ortlieb, Arkel, ? . Cost isn't my concern- but it has to be justified. Form, function, waterproofness, portability(shoulder strap) are important. Your thoughts?