Pet Front Carrier Backpack- Shoulder Bag Mesh Travel Sling Backpack for Dog Cat 8.8 lb/17.6 lb -4 Colors and 2 Sizes Optional S :33 x 13 x 35 cm(13'' x 5'' x 13.8'');L :40 x 16 x 35cm ( 15.7" x 6.3" x 13.8") MATERIAL: With advanced Nylon Mesh Fabric + PVC Material, head out design, breathable and comfortable for your pets. CONTRACTION ROPE DESIGN: Easy to adjust according your pet head Inside hook design connects to pet's collar through slightly direct pressing against collar's loop to prevent your loved pet jumping out to ensure its safety. Size S:Suitable for Small pets, dogs, cats that within approx. 8.8 lb.Size L:Suitable for Small pets, dogs, cats that within approx.17.6 lb. Perfect for using when Traveling Outdoor,Hiking,Walking ect.