1.BREATHABLE & DURABLE MATERIAL:Made of good quality oxford,breathable,comfortable,fine workmanship,durable oxford fabric guarantees long term use,it's strong enough to resist pet claws or bites. Universal for all four seasons. 2.SUITABLE FOR DOG, CAT OR OTHER SMALL ANIMALS: this pet carrier has 2 different sizes to choose from, Size S: 13.7x11.9x5.5inch/35x30x14cm (LxWxH), it is recommended for pets under 4.41 lbs / 2 kg; Size L: 15.7x12.6x6.3inch/40x35x17cm (LxWxH), it is recommended for pets under 8.82lbs/4kg; Suitable for dogs, cats, puppy, kitten, chihuahua, rabbits, teddy cup or more small animals. 3.KEEP YOUR PET VISIBLE AND SAFE:A neck hole with drawstring on the top of the bag to keep your pet off the head,make them ventilated and visible,the A hook design inside for hanging pet's collar, good control to prevent your pets from accidentally falling off and the soft mesh padded edge to ensure its comfort, make it feel comfortable interior. 4.PADDED SHOULDER SHOULDER, TWO POCKETS FOR STORAGE: Widened adjustable shoulder pad design to help reduce your load and increase comfort. With adjustable buckles on the bottom to prevent shoulder strap deflection and maintain the stability of the backpack. The 2 mesh side pockets can store leash, whistle, water, snacks, treats and other necessities. 5.OCCASION AND WIDELY APPLICATION: Backpack design is perfect for outdoor use. daily outdoor activities such as transportation, travel, walking, strolling, the mall, the subway, the grocery store and the vet, you can take your puppy anywhere.