I've used it a few times, but it was too small for me, so I'm selling it. Mantis 1 Waistpack The Mantis 1 is made with 100% recycled polyester. It's great for short hikes or as an auxiliary pack on longer treks. It's a convenient design that can be worn around the waist or over the shoulder. The back panel uses Spacermesh™ for improved ventilation. The zippered front pocket has a key clip. There's also plenty of internal storage, including an easy-access stash pocket and a zippered security pocket. The discreetly convenient back panel pocket can hold a smartphone.