Waterproof would mean welded rolltop which only leaves Ortlieb. If water resistance suffices (19/20 times it does, just put your passport in a ziplock bag if there's going to be heavy rain) the bigxtop bar bag is a very clever design: https://bigxtop.com/products/rando-bar-bag
Waterproof would mean welded rolltop which only leaves Ortlieb. If water resistance suffices (19/20 times it does, just put your passport in a ziplock bag if there's going to be heavy rain) the bigxtop bar bag is a very clever design: https://bigxtop.com/products/rando-bar-bag