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@jborg, by overfilling LP tanks, you can pack substantially more gas into a moderately sized/weight tank. This can be particularly important on technical and cave dives where bringing extra gas is critical. For example, if you overfill a LP 95 tank, you can get nearly 130 cf of gas into the tank. To get that kind of gas in a service rated tank, you'd need to go to the much larger and heavier HP 133. Sorry for the imperial units , but hopefully this helps.
95' and 133's are not the same size. 95's and 117's are, and 108's and 133's are. The 117's are only 1.5lbs heavier than the 95's but both are 15L bottles, and the 133's are also about 1.5lbs heavier than the 108's with both being 17L bottles
These bottles are all the same diameter, and the length difference is negligible for the 108/133 and less than half an inch for the 95/133's. I would hardly call that much larger and heavier.
@Addison Snyder the bottles are not identical to the Euro tanks that are 250/300bar rated. They do have different specifications per Faber themselves. I have the spec sheets for them and they have different alloys. If they were in fact the same, then the manufacturers wouldn't have had to get special DOT permits for the HP bottles to keep their weight reasonable.