Nalgene 6303 Spiral-Bound Field Notebook with 6mm Green Grid Lines can eliminate problems caused by moisture or chemicals. It features a flexible, yet durable blue polyethylene cover with sheets permanently spiral-bound and paginated for data security and traceablility. Includes 96 numbered plastic pages printed with a gree, 6mm grid on both sides. Polyolefin pages hold up to repeated wetting and chemical exposure. Notebook can endure salt water, mud, chemicals, all kinds of dirt and still protect your data. Book opens to lay flat.