IMHO there are very few good reasons why not to use a bigger tank.
With 12L being the standard I own one 15L tank and I'll always put it on a single-tank diver if they want to use it. In our cold water we have to use drysuits or thick wetsuits, so there is no chance of them not needing a weightbelt. My heavier tank means a little weight off their waist & that's always a nice thing. A bigger tank also provides a little extra reserve and/or a chance for both of us to stay down a little longer if they wish, esp. since most of us buddies have double 10L or double 12L tanks.
I also feel that it's great giving a new diver less to worry about. If they have a larger tank than the old boys, or at least a larger tank than they are likely to need, they don't need to worry about running low on air or cutting their buddy's dive time or being exposed as an "air guzzler". I'm happy with anything that lets a new/otherwise unsure diver to relax and feel less task loaded.
With 12L being the standard I own one 15L tank and I'll always put it on a single-tank diver if they want to use it. In our cold water we have to use drysuits or thick wetsuits, so there is no chance of them not needing a weightbelt. My heavier tank means a little weight off their waist & that's always a nice thing. A bigger tank also provides a little extra reserve and/or a chance for both of us to stay down a little longer if they wish, esp. since most of us buddies have double 10L or double 12L tanks.
I also feel that it's great giving a new diver less to worry about. If they have a larger tank than the old boys, or at least a larger tank than they are likely to need, they don't need to worry about running low on air or cutting their buddy's dive time or being exposed as an "air guzzler". I'm happy with anything that lets a new/otherwise unsure diver to relax and feel less task loaded.
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