If you want a purpose-built battery that doesn't add much weight and brings a ton of function, we'd say the $99 MagSafe Battery Pack fits the bill.
⚡【Compatibility】Hard EVA travel portable case especially designed for Apple MagSafe Battery Pack (Case Only, Apple MagSafe Battery Pack is not
Shockproof Carrying Case Compatible with MagSafe Battery Pack, Hard EVA Travel Protective Storage Case for MagSafe Battery Pack with D Buckle -Black
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Durable Design: Made with polycarbonate and TPU materials to protect from scratches and drops. Customizable Style: Allows you to add stickers or
elago Hybrid Clear Case Compatible with MagSafe Battery Pack - PC + TPU Hybrid Technology, Anti-Yellowing, Crystal Clear, Shockproof Cover, Protective
FIND] Apple Magsafe Battery Pack USB-C : r/RepTronics
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