Rather depends on the sort of high jinks you get up to on the beach !
But minimum is a "ziplock" sealable-type clear plastic bag, for waterproofing protection from you or others returning from swim and shaking dripping follicles & limbs in all directions.
Oh, readers don't function too well underwater, don't try !
If it's a pebble beach, more care needed - padded cover/bubblewrap packet, that sort of stuff. Bit dicey, really. Drop it once and that might be that........
I've successfully used one on a hot sandy beach scenario, but frankly, the precautions needed to feel "safe", and the stress involved (!), plus the worry someone might nick it while you're cavorting in the briney, made me decide paper probably easier all round !
I'd say keep it for the hotel/villa/caravan/campervan/ tent...sleeping bag ?
