Pac Safe sales have taken off since they started making mc specific gear.
The advantage of a back pack is that you can take off for a overnight stay if walking is the only way to get there. Also makes a day or half day hike easier. A pacsafe 25-55 litre (weights 500 grams with padlock) should cover the back pack on your bike- or your helmet, boots, jacket if you take the back pac and need to leavce your gear. They make a larger size 55l -?75l?
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S