scubafanatic
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If you look at all the possible tanks you could get, an Al 100 has to be the worst... a luxfer is roughly 27 tall, by 8 inches in diameter. it weighs in at 41 lbs, and when empty is 3 pounds buoyant. Compared to say a Faber FX 100... which is 25 inches tall, by 7.25 inches around, weighs in at roughly 34 pounds and is zero buoyant. That means all setup, the Faber weighs around 10 lbs less for the same amount of air. The Worthington is around 4 lbs better than that. Even a Worthington 119 cfm tank is lighter to carry and smaller (as is the Faber 117).
You have to go all the way to the Faber 133 before you get a tank of similar size and weight.
AL100's aren't exactly toxic waste, if you travel to dive and want a bigger capacity tank, many dive ops will only offer AL 100's as their biggest tank option, so sometimes you'll be thankful to get 'em! I can dive AL 100's and really not notice any appreciable difference over the AL 80's underwater, but I'm pretty used to diving bigger capacity steel tanks too, so the somewhat higher weight/bulk is pretty unnoticable to me.