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Indigo's Baggage Allowance Page contains this text:
Baggage allowance for International Connecting Flights:
IndiGo Domestic Sector connecting to IndiGo international sector or vice versa:
IndiGo's Free Baggage Allowance for International sector will be applicable
IndiGo Domestic Sector connecting to another airline to/from an international destination:
15 Kg per passenger per flight