I also used a random old strap from a knackered rucksack to make it doubly secure on the rack. Then I added an old toestrap to hold the map in its protective freezer bag.
@Cupcakes started
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I also used a random old strap from a knackered rucksack to make it doubly secure on the rack. Then I added an old toestrap to hold the map in its protective freezer bag.