Hi. In principle you can put anything inside our case and it will be waterproof, but this might be a tight fit if you have your phone, keys and valuables in there. The keys might be under so much pressure that they damage the case. We would suggest going for a bigger case like our tablet range to carry all your valuables safely. https://aquapac.net/shop/waterproof-ipad-kindle-cases/waterproof-kindle-case-658/
IPhone 6 plus keys and valuables