Because you can't (well, shouldn't) physically hold stuff while riding, this trunk bag is a solid option. It's water resistant. It has a lockable zipper. Its EVA foam core makes it sturdy.
Easily attach to your rear rack via hook and loop straps, or upgrade to a MIK adapter plate for even more convenience. All that's left to do is fill it with your favorite things, which you can easily access thanks to the hinged lid.
