Rucksack styles bags allow for a little more convenience if walking for longer distances to a snorkelling site as the shoulder straps keep your hands free to hold other items. Rucksack snorkelling bags are still typically constructed from mesh panels for breathability but will feature a hard wearing bottom that will resist scratches and abrasion. It is also common to find an external zipped pocket or two for storing small items that need to be accessed quickly.
Dedicated snorkelling bags are designed to hold one complete set with compartments for a mask, snorkel and fins. These types of bag are usually fitted with an over the shoulder strap, are made from a harder wearing material and mesh panels for air flow, a large compartment for fins and then separate external pockets for a snorkel and a mask.