Alright, so I’m kind of obsessed with having portable batteries with me. I carry this one in a black string backpack with me everywhere. I have offered a charging cord to so many people in a club at 4 in the morning—it’s very handy. I highly recommend my always-charged 🔋 lifestyle. It’s also nice to always be able to leave the house without worrying if my phone is charged. This thing holds about 4 or 5 full phone charges, so I have rarely been in a situation where it doesn’t last long enough for one outing (or trip through multiple airports, a 3-day festival, a picnic). Also it looks like a Rimowa suitcase so yeah…
Note: it’s regrettably not actual metal, it’s painted plastic, which kinda sucks because it wears off around the edges eventually and it's not a great look. But I still recommend it. There’s also an all-black version that looks pretty hot. I also have this portable charger, but it’s a bit too techy for my taste.