Stroller folds with the adapter attached on Vista (2015+), Vista V2, Vista V3, Kona and Cruz — but not on Cruz V2 or Cruz V3; fits Vista 2015+ only.
On Vista in double mode, a Chicco seat goes on top with Upper Adapters for Vista plus this adapter, or on the bottom with Lower Adapters for Vista plus this adapter.
About this pair
The Chicco Fit2 goes on the UPPAbaby Cruz V3 with the UPPAbaby Chicco adapter for Vista and Cruz (model 0156), about $49.99. With the carrier on, you are pushing about 37.5 lb (26.5 lb stroller, 11 lb carrier). The seat itself is rated up to 35 lb and up to 35 in, per Chicco.
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32 other infant seats fit the UPPAbaby Cruz V3; UPPAbaby Aria V2, UPPAbaby Mesa (original), UPPAbaby Mesa Max and 2 more need no adapter at all.
Summary from the makers' published data.
How to set up the Chicco Fit2 on the UPPAbaby Cruz V3
What you need
The UPPAbaby Cruz V3
The Chicco Fit2 carrier (its car base stays in the car)
The UPPAbaby Chicco adapter for Vista and Cruz (model 0156)
The adapter maker shows the fitting steps in pictures; see the manuals below.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.
UPPAbaby says it needs an adapter (Chicco adapter for Vista and Cruz).
“Compatible with Chicco® KeyFit® 30, KeyFit® 30 Zip, KeyFit® 30 Zip Air, KeyFit® 35, Fit2®, Fit2® LE, Fit2® Air … Compatible with Vista 2015+, Vista V2, Vista V3, Cruz, Cruz V2, Cruz V3, Kona”