20 - 35L Fordable Hiking Backpack - Ultralight Packable Outdoor Backpacks Carry on Lightweight Waterproof Day Pack - Camping Running Sports Ultra Light Travel Bag - Women Men Dayback (Blue) Two-way zip-around closure with rain flap Lightweight durable backpack folds easily to conserve space The water resistant nylon construction adds convenience Two large side mesh pockets for water bottles or umbrella Adjustable breathable mesh shoulder straps