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68ci (cubic inch) is your tank size - Volume / 4500 psi (pounds per square inch) is the pressure the bottle holds. Carbon Fiber tanks are much lighter then Aluminum, typically weighing in under 2.5 lbs filled. Carbon Fiber tanks are actually an aluminum cylinder wrapped in carbon fiber for strength. Tanks will require a hydro test every 5 years. the 68 ci is the most popular size carbon fiber bottle as it's the perfect mix of size / weight and being able to last a few games. Maddog Sports.com carries a full line of Paintball tanks with free shipping on tanks >$50