I’ve had an Ortlieb “Vario” for a couple of days now – old North Face pack finally got too ratty to use.
So: 15 minutes in an absolute shagging downpour and everything inside was bone dry. No “up and over” zip to let in the water – simple solution of rolling up the top which then velcros into place. No need to ride around with the word “Hump” on your back…
It’s a pannier bag that converts to a backpack, but I’m using it as a backpack (wouldn’t fit on the Brompton). Massively comfortable, even when packed solid – the back rest is semi-detached from the bag itself, so isn’t affected by the rigidity of full packing.
Very light, but strong. Internal bracing means even with a few heavy items in the bottom, it won’t sag and get uncomfortable.
Two “pocket” enclosures inside for bits and pieces, otherwise it’s just one big space for everything else – no compartments.
Pricey, mind – but it’ll likely last for a good few years. Maybe even longer than I will.
Recommended. 😀
http://www.simpsoncycles.co.uk/product.php?xProd=2401