Karpik has represented New Zealand at both schools and Under 20; he was a member of the 2015 New Zealand Under 20 who won the World Rugby Under 20 Championship in Italy.

His impressive performances in his Under 20 Campaign as well as a solid Bay of Plenty provincial season secured the flankers spot in 2016 Gallagher Chiefs squad and made his Investec Super Rugby debut later that season.

Karpik has also represented the Māori All Blacks in both their 2018 & 2019 campaigns.

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