Canned Oxygen: $9.99 and FREE Shipping (50% savings) at http://www.swagoxygen.com/promotions.htm for coupon code "1CAN50OFF" expires on 05/31/2017. SWAG Oxygen is portable canned oxygen that you can take with you anywhere. We are #1 in oxygen can size and best priced in the USA. Each can size of SWAG oxygen is 32 ounces and contains 12 liters (volume) of 95% oxygen (the air we breathe is 21% oxygen). Product contains up to 250 Inhalations. A few deep breaths can make a huge, positive difference in how we feel, perform and recover.