This big travel is our biggest bag. This is three bags in one. A suitcase, a rucksack and a day pack. It is perfectly suited to trips away where you need to haul your gear on extended trips. It has two sturdy wheels with a pull out handle, It also has a full rucksack back system with adjustable shoulder straps hip belt and chest fastener. The zip off is a great 40L day pack with a super comfortable back system, this also has zip closed bottle holders on each side and double main pocket pockets.