Petstranaut Backpack Bobble Expansion Black Breathable & Ventilation: 6 Vents around the backpack side and extra 3 vent holes in front to perform air flow and ventilation, Side Access Window Allows the Pet to Access in & out Easier without Unzipping the Front BubbleWell-made Backpack for Cat, Made out of Waterproof 600D Poly and Breathable Mesh, Padded Foam on Back for Comfortable Fit and Adjustable Length of Shoulder Straps with Chest Buckle Security.