Ships with one 3 liter silicone (latex free) breathing bag. A bag clip to reduce the size is also included. Replacement or additional bags can be ordered separately (see below).
Note that the Spirotiger firmware is programmed for a maximum bag size of 5L. It is the user's responsibility to make sure the 5L bag is used carefully to prevent hyperventilation, low SpO2, hypercapnia, etc. An O2 saturation meter (Oximeter) should be used during training and possibly a capnometer as well.
Discount offered on an Oximeter if purchased along with your Spirotiger. The Oximeter will help you control your SpO2 to make sure you are not going low by improper use of the Spirotiger.