Four entrances, easy to access:1 Top loading, 2 large side entries, 1 front entrance.Your pet can poke her head out from the top loading.The Top opening with enlarged size is convenient to get in or out.This portable pet carrier is collapsible, just unzip all zippers,folds down flat for easy storage when not in use. Large Cat Carrier Size: 19.5"L *12"W *12"H?50*31*31CM?,available for pets up to 20lbs (19"L*11"W*11"H).Do NOT select the carrier based on weight only.It is based on your pet’s measurements first, then make sure not to exceed the maximum weight limit (20lbs).Please measure your pet's size before acquisition. Two sides expandable:The pet carrier bag can be extended on 2 sides?front and back, creates a comfortable extra room for your pets to move around, The front expansion can be opened as an entrance after unzipped. Rugged frame to stay upright:upgraded structural design of steel strand to make sure that the pet bag will not be out of shape or sagged when you are out with your cats/puppies. The top does not collapse due to the sturdy steel frame. Well-ventilated: 3 large storage pockets with ventilated mesh,which is convenient to store pet food,treats, vet paperwork or outdoor supplies (documents/ snacks/toys/pads/sanitary bags/wipes/treats/catnip).Suitable for travel/vacation/leisure/hiking/home/pet house/pet clinic/airport/plane/car/outdoor activities etc.