ManavBansal - I’d put my car keys, phone and wallet in there, perhaps sunglasses and a bottle of water too. When I’ve had bags like that on holiday, I’ve been able to hang my beachtowel over it whilst it’s on my shoulder.
It’s getting hotter in the UK, so I’m no longer carrying a coat around and I don’t want stuff bulging out my pockets. A small bag I can throw things into and hang up somewhere would be handy.