【Designed for southwest airlines】Size of carrier is 18.5''(L)x13.5''(W)x9.5''(H),it match southwest airlines requirement about soft-sided pet carrier(18.5'' x 13.5'' x 9.5'').this size is the max size which southwest will approve. 【For extra-small dog puppy small-medium cat up to 6 lbs】Judging suitability based on weight is not accurate sometimes.this size is external.Please measure the pet's size before purchase,length should be less than 17",width less than 13" and height less than 9".[NOTICE:DO NOT BUY THIS if your pet is longer than 17 inches,this carrier IS NOT FOR MEDIUM / LARGE SIZE ADULT DOGS OR LARGE CATS ] 【Expandable side provide more space for your pet】This carrier have a accordion-style expandable part in the right side,it will provide 20% extra space for your pet,and better air flowability and visibility when your pet in a small and limited space under seat. 【Keep stable and safe in travel】This carrier have a double metal frame in 2 sides,it will keep it's shape well and not fall in body of your pet when you opened 2 doors in side.A hard plastics board in padding will support bottom of carrier. All doors for entering have double zippers with black hooks to prevent pet opening and escaping,netting cloth is durable,a tether in carrier can be connected to harness of pet to prevent pet move and escape. 【Match your needs in travel】This carrier have 4 entering ways for your pet,2 different pockets for storage,1 pet card which you can write informations about your pet in it,padding in bottom is soft and comfortable for your pet and easy to clean with machine,a shoulder strap for you to carry it,all hooks in shouder strap and D-shaped buckles are made of metal instead of plastics,fabric of carrier is 600D oxford cloth,these materials provide better durability for carrier.This carrier also can be uesd for a short-distance car trip except airplane travel,like vet-visit.At last it can be folded and stored easily when you don't plan to use. 【1 year warranty policy】We provide a one-year warranty for the quality of our product.Included zippers uckleshooks abric.Damage by improper use mesh damage by animal bite and scratch are not included. pidipiti 18.5''(L)x13.5''(W)x9.5''(H) southwest airlines approved expandable pet carrier,for extra-small dog puppy cat weight up to 6 lbs and length up to 17.5''(black)