5. Speaking of which, bring a back-up charger. We like the mophie space pack, it’s the world's first smartphone case with built-in storage for the iPhone 5/5s. In addition to providing 100% battery boost, the space pack allows users to save and share more photos, videos, music and documents within their iPhone case. This way you can stay in touch with your friends and take photos of all your favorite DJs and not worry about that gnawing red battery alert.