So many options, so much versatility! This travellers backpack fro Numinous boasts superior anti-slash technology, along with a shield combination lock system and TSA approved zip locks! There is also the added option of attaching the 25L DaySac to increase the volume to 80L - simply awesome! Other features include a strengthened anti-puncture zip, compression straps, full length opening and TSA-approved zip locks. Padded lumbar support and airflow system support this product's quality, while mesh side pockets ensure even your odds and ends can join you on any quest! You'll be instantly satisfied with the backpack that just goes "whack!" with astounding features - make it yours today!