The Monterey Series makes travels with your pet easy. If you have ever tried to carry a pet carrier while juggling a cellphone, baggage and boarding passes you will appreciate the ease of carrying your pet on your back in a horizontal pet carrier. The Monterey offers a unique and versatile combination of Backpack practicality featuring Premium Self Locking Zippers & Thermal Comfort Padding on Two Sides. This backpack allows your pet to be horizontal, unlike most pet backpacks which are a vertical space for your pet. The Monterey is designed for Biking, Travel, Hiking & Fun with Your Best Friend The medium size is excellent for in-cabin airline use, designed to lay on its short padded side for pet comfort and ease of under seat compatibility. The large size is best used for transcontinental and international routes only, as those aircraft typically have larger under seat spacing than the aircraft used for regional routes. Newly updated in two sizes with a larger interior space and more comfort for both pet and user Free Gift - All purchases of a pet carrier(s) from Mr. Peanut’s direct site receive a complimentary set of 4 Premium Gel Pee Pads and a collapsible travel bowl for each. (Excludes Amazon Buy With Prime purchases) * Premium Brand Auto Self Locking Zippers for Safety and Eliminating the need for fragile clasps as the tote cannot be pushed open by your pet from the inside * Washable Nylon Plush Thermal Comfort Padding with Composite Base For Pet Comfort and Weight Handling Stability * Medium Size - Recommended For Pets Up To About 15lbs (6.8kg)* * Medium Size Dimensions: Upright: L18.9" x W9" x H11.4", Side Position: L18.9" x W11.4" x H9" * New Large Size - Recommended For Pets Up To About 24lbs (10.9kg)* * Large Size Dimensions: Upright: L19.7" x W9.8" x H12.6", Side Position: L19.7" x W12.6" x H9.8" * I discourage using weight only as a sizing indicator, as it can be deceptive. Get a good measurement while your pet is comfortably laying down and match up to the interior sizing of the carrier of interest for best sizing results. * See Size Image for Details * Medium Weighs Only 2.8lbs (1.27kg), Large Size 3.3lbs (1.5kg) * Open Air Large Mesh Windows On 4 Sides * Loads from Each End * Zippered Mesh Pocket Plus Second Zippered Storage Pouch For Storing Treats, Meds, Papers * Laptop Sleeve (Less than 13") * Padded Shoulder Strap with thick metal connectors (Note that the Shoulder Straps are NOT Removable) * Chest Strap Included * Wipe Down Composite Enhanced Nylon Soft-Sided Pet Carrier * Leash Tether * Luggage Band Strap * Seatbelt Attachments & Name Tag Holder * Leak Proof Design and Materials MR.