For boat diving, E-series 130s are my choice.
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Favorite tanks:
#1 -- HP 100's -- mine are now doubled and are great as singles and even better doubled
#2 -- HP 130's -- more gas than my doubled 72's, good weight and balance characteristics which are important for the cold water diving I do
Absolutely HATE AL 80's!!!!! What an evil tank.
With students or local diving with most people, HP71s...nice and small and more than enough gas