Dimensions - Exterior: 13"L x 17. 5"W x 20"H - handle adds 22" In height when fully extended. Interior: 12"L x 11"W x 18"H - Weight capacity: up to 18 lbs (approximate). Please see product images for more detailed Dimensions. MULTI FUNCTION - Fits your Need as Backpack, Rolling Carrier , Tote Carrier and Car Seat Carrier. Smooth spinning wheels - easy motion two-wheeled platform allows for easy maneuvering through airports, airplane aisles, malls, supermarkets, etc 3 different ways to carry - telescoping handle, strap handle and Backpack straps provide 3 Easy and convenient carrying solutions for different everyday needs. Lots of storage - 2 Large pockets are perfect for safely storing the stuff your pet can never be without. Durable, heavy-duty materials - Backpack: 600D Oxford fabric with 3 ventilation mesh panels that provide a cool environment and easy visibility. Telescoping handle: industrial grade aluminum alloy Rods. Wheels: high-quality polyurethane double wheels provide extra stability and durability.