Easily turn you Trend Duo into a travel system with these adapters, available in three options to suit your needs. Choose the one that's right for you:

Maxi-Cosi/Nuna/Cybex Adapter – Compatible with most US models of these brands.
Universal Adapter – Fits most infant car seats (except Doona).
Twin Adapter Kit – Includes one Maxi-Cosi/Nuna/Cybex adapter and one Universal adapter, allowing for dual car seat use. (For twin setups, one of each adapter type is needed, as two of the same won't work.)