Powershot Backpack Is Bringing A Regular Sized Jansport Backpack To Warped Tour Too Big?

Is bringing a regular sized Jansport backpack to Warped tour too big? - powershot backpack

I will start a tour WAPR this year for the first time. I saw what to bring and all, but it's like a regular black JanSport backpack big? Like 2BBL.jpg this http://ecx.images-amazon.com/images/I/31FKL9jW%? And I know are cameras allowed, but just to be sure, is allowed a Canon PowerShot? Thank you for your help:)