Patagonia Critical Mass Messenger Bag 30 liter size measures about 22 across and 15 in length zippered flap pocket, side water bottle pockets Main compartment houses one zippered pocket and padded sleeve holds tablets, small electronics and most laptops (up to 17 inches) Large elastic side pocket holds a phone, power cord or water bottle Reflective top flap External zippered, water-resistant pocket Toting options include an adjustable, padded shoulder strap and top carrying handle Made of sturdy, recycled polyester with a polyurethane coating and Durable Water Repellent treatment for weather resistance in good condition from smoke and pet free home