“You know, I probably wouldn’t call it ‘the hump,'” said Cook, who is aware of criticisms over the battery case which features a large rectangular bump at the back.
He notes that unlike other cases, Apple's is easy to put on and take off.
“One of the real insights here is, have you ever used other cases and tried to get them on? If you make this solid all the way across [pointing to the top portion of the fluoroelastomer casing] in order to get it on, you’d find it very difficult to get it on and off.”
Cook also noted that those who charge their phone every day probably don't need the case but if you are on an overnight trip it could come in handy.
"If you’re charging your phone every day, you probably don’t need this at all. But if you’re out hiking and you go on overnight trips… it’s kind of nice to have."