The Back Roller XL bicycle bag is made of durable waterproof polyester tarpaulin material. This material is resistant to abrasion. The packing volume is 70 litres per pair and is suitable for long journeys. The bag features a practical front pocket. It offers four litres of additional volume per bag for items you need quickly but is not waterproof. The reliable roll closure protects the bag's contents from moisture and dirt. The Quick-Lock mounting system allows for easy and secure attachment to standard luggage racks. Manufactured in Ortlieb's factory in Heilsbronn. The construction is repairable and designed for durability. Waterproofing is standard.