[Bibio]

depends on what you want to store in the tailpack.

if its just clothes and footwear then get roll top dry packs made for canoeing. they are cheap as chips compared to stuff like Kriega. make sure that you get a few simple cam buckle straps of you go for roll top bag.

there are also dry duffel bags as well.

if you want to be all biker fancy than yes buy Kriega. word of warning about Kriega stuff. while the main compartment is dry due to an inner bag the outer pockets are not waterproof. Kriega stuff is like biker clothing that rely on a drop liner for waterproofness. yes its dry on the inside but all the pockets are full of water. canoeing stuff is waterproof on the outside.

do not buy anything that requires exterior rain covers... they WILL let water in.

then there is the old rubble sack trick. use any old bag/rucksack and put your clothes in rubble sacks NO NOT BLACK BIN LINERS.

also always carry marigolds and a dish towel......