40L Waterproof Climbing hiking backpacks Travel Backpack Bike Bicycle Bag Camping Hike Laptop Daypack Rucksack Outdoor Men Women Sport Bags Features: Water repellent and tear resistant nylon fabric. High quality zippers, easy zip and unzip. Two sides mesh pocket for water bottle or other accessories. Breathable and padded back panel.Adjustable sternum strap and shoulder strap. Survival whistle for emergency.Side and front adjustable straps for hanging trekking pole, tripod or anything you need.