Streamlined, single bag bladder assemblies can be found on many of our Recreational and Travel BCs but you can also purchase the bladders separately to add to a backplate, replace a damaged bladder, or to change the lift capacity of a stock Zeagle BC. Each bladder uses bungee cord retractors to keep the bladder tight and the exterior is a durable 1000 denier nylon to protect against the usual bumps and scratches.