How to prevent iPhones glass breaking in kids backpack?
Get a case and a mirror screen protector for it. Well you can also get a clear screen protector for it but the mirror screen is so nice to look at and plus your phone turns into an actual mirror when you shut it off.
A protective case should do the trick
Put it in a case that has some padding.
Get a really sturdy case and keep your phone in the outside backpack so when you have it on your back you wont crush it.