we show the exterior dimensions as well as approximate interior dimensions to best portray the usable interior space for your pet. The interior space will be less than exterior due to the fabric thickness and plush faux fleece padding. The rounded contours of the tote design means interior dimensions are approximate and shown at their maximum measured points MR. PEANUT'S GOLD SERIES PET CARRIER FEATURES Premium Brand Auto Self Locking Zippers for Safety and eliminating the need for fragile and unreliable clasps as the tote cannot be pushed open from insideRecommended for Pets Up to 15lbsAirline Capable 18" Length x 11" Width x 11" Height, best fit for pets approximately 16" in length while laying downPlush Faux Fleece Pad with Plywood Base Insert for Additional SupportWeighs only 2.9lbsOpen Air, Teslin Resin Mesh Windows on Top and all SidesFabric Roll Away Privacy CoverLuggage Strap CARRIER STRUCTURE Soft Sided Pet Carriers by definition are frameless and are mostly only supported by thin steel wire running along the edges and sides of the tote. Keep in mind when you look over images in a listing on any product those will be taken to show off the product in the best possible way, and are often edited to improve the look of the product image. UNDER SEAT COMPATIBILITY In short, all of my airline capable carriers are regularly used on domestic and international airlines, and all are compliant with under seat requirements, but the reality is that there can always be an aircraft or route of a particular nature that uses a smaller aircraft without under seat clearance. AIRLINE COMPATIBILITY I work with representatives of the major airline carriers in the design of my totes, including most domestic airlines, and at this point over the years my various totes have been used on virtually every airline around the world. SAFETY SEAT BELT ATTACHMENTS It is important to point out that there is a substantial design difference between a frameless soft sided airline capable pet carrier and a standard carrier. Keep in mind the priority for an airline capable carrier is the ability and pliability necessary to accomplish under seat requirements. The larger Gold Series Big Apple sized model is about as large as one can go for airline capability. It is about an 18" (46cm) interior length but the same height and width as the standard sized models. The exterior is about 2” (5cm) longer at 20” (51cm) exterior than most airlines will spec, but it’s built for those pets where there is simply not an option for a smaller size. The Big Apple model has been on the market for a long period of time now, literally sold worldwide, and a very popular model. I have yet to receive a review or complaint of it not being accepted by an airline. It is a good fit for pets of similar size as larger cats, medium Frenchies, Maltipoos, Corgis, Bostons, Pugs, etc. Backpacks are a great choice for taller pets or those users who seek to take the weight off of their shoulders and free up their hands in busy airports. All of the backpack models are made to lay on their short sides for under seat use, and are padded on both bottom and sides for this. The smaller backpack models consist of the Vancouver, the Monterey, and the Malibu Series. Those smaller backpacks are best fit for smaller cats, small dog breeds such as Chihuahua, Yorkies, Bunnies, etc. The larger backpack models consist of the Aspen and the Tahoe Series. These models well fit medium to large cats, small Bostons, Daschunds, small Pugs and similar sized breeds. And for even larger pets where airline capability is not needed but maximum space is desired, do check out the Coronado XL Series as well as the Mr. Peanut’s Portable Pet Crate. Both are structured larger models with considerably more height and space than airline capable carriers can offer.