I came across
this recently. Extremely lightweight bottom bracket and cassette tools. (100g or so total for the cassette, bottom bracket and crank adjuster).
I couldn't find any review however.
Are they any good? The use case is to carry along on tour to deal with emergency repair (i.e. not a shop tool in constant use. I am willing to pay to get reliable lightweight tools but do not want to have to hope that they will not break on the first occasion.)
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UPDATE
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[based on comments below] I've ordered the WolfTooth tools (
Hollowtech II handle +
lockring socket). Will "Update 2" once I've received and tried them.