Pawaboo Pet Carrier Front or Backpack Adjustable Size Large Blue/Black. Sturdy fabric with thick inner sponge ensures durability and provides comfort for you and your pet. Wide straps with hook and loop closure to adjust to the size of the pet's head. Breathable with plenty of mesh area to provide adequate ventilation and keep your pet cool. Size large fits smaller breeds like Boston Terriers, etc. or equivalent size puppies.