Sometimes, your counter lungs can be a pain. ¬†The bulky things take up a lot of space on your chest, they are annoying and can get in the way of you being able to access other important gear. ¬†The Back Mounted Counter Lungs for the Poseidon SE7EN quickly become a favorite of divers after a few uses. ¬†They are easy to manage, and the free space on your chest is liberating. ¬†For you technical divers out there who like the option of manual injection, that can easily be added on using the BMCL manual injection pack.