Are the Backpacks Comfortable? Our Backpacks are super comfy thanks to the padded back and padded shoulder straps, which are adjustable for the perfect fit! The back of the bags and the straps have a mesh finish to help keep your back nice and cool on those hot summer days! Vanessa Martell-Mead How do I clean my MontiiCo Backpack? Is Yumbox Leakproof?