Features: THERMAL INSULATION: Thickened triple-layer design guarantees long preservation. 17L large capacity offers more storage space. STURDY: Constructed from 600D Oxford cloth + 8MM Pearl-cotton + PEVA film, thickenedtriple layers with stereoscopic square designensure durable usage, and provide more capacity. INTERNAL WATERPROOF: The hot-pressing processguaranteessuperb water storage. Be reminded that if you add water to the bag, please do not tilt and flip. CONSIDERATE: Frontside pockets ensure easy access to tissues, tableware, umbrella, and insulation bottle. Two-wayzipper; Widenedcarrying handle; Detachable buckle.