Nike Expandable Lean Unisex, Hyper Pink, Size ONE SIZE. Streamlined storage over any distance: The Nike Expandable Lean Running Waist Pack lets you take cards, keys and cash along without adding too much bulk, made of stretch nylon mesh and a bonded zip to keep essential items secure in a lightweight package., Benefits: Bonded zip pocket to keep items secure, Reflective taping for high visibility in low light, Lightweight stretch mesh fabric for expandable, breathable storage, Adjustable stretch strap for a customised fit, Product details: Fabric: 100% nylon, Spot clean, Imported: .