Perfect Matching-- It's professionally made for Anker 621 Nano Power Bank which compact room can hold neatly. ^^ High Density-- The material we use if of eco-friendly ingredient: EVA semi-hard shell and polyester inside. It's not only high-quality but durable in use. ^^ Easy Carrying-- The light weight and compact design makes it more portable to carry everywhere. ^^ Precise Space-- Professional design case for your Anker 621 Portable Charger that is concise but precise, portable and compact. It'll fit your needs to organize and carry. ^^ Eco-Friendly Materials & Self-designed Product-- Crafted from eco-friendly materials, compared to other storage cases on the market, our fabric, lining, and EVA compartments are all certified by RoHS/SGS. We use a higher-grade thickness of EVA to ensure our Self-designed storage cases is not deformed easily. It comes with a two-year warranty, guaranteeing long-lasting quality and performane