Where do i put my bag in alton towers?

I'm going to alton towers soon, and i need to take my bag with me, probs with like a phone, money in it etc... I want to know where can i put my bag when i am on a rollercoaster, especially the big scary ones, as i dont want to put it in a locker at the beggining of the park as i will not have access too it ...Thankyou :D Oh and on the not so scary rides, am i aloud a camera on board? thanks x