There are waterproof / splashproof cases available for ereaders. Some as fancy as molded clear plastic, others are plastic pouches, but of a better weight than a freezer bag so you don't get the rippling plastic obscuring the screen. Just googling "waterproof kobo" brings up several results. Amazon is sure to have a selection. Many ereaders are similar in size, so the pouch-type cases work for many different models.
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