Nuna also sells these two together as the Nuna | PIPA urbn + TRIV next travel system.
This answer is for the Nuna TRIV next.
Key specs
Adapter
In the box
Weight with carrier
25.4 lb
Seat rated to
30 lb, 29 in
On planes (FAA)
Yes
Stroller folded
L 24 x W 22.5 x H 15 in
Good to know before you click it on
Remove the infant carrier before folding; the stroller can fold with the ring adapter still attached using the adapter fold strap.
About this pair
The Nuna Pipa Urbn goes on the Nuna TRIV next with the Nuna TRIV next folding car seat ring (in the box), which ships with the stroller. With the carrier on, you are pushing about 25.4 lb (18.4 lb stroller, 7 lb carrier). The seat itself is rated up to 30 lb and up to 29 in, per Nuna.
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8 other infant seats fit the Nuna TRIV next.
Summary from the makers' published data.
How to set up the Nuna Pipa Urbn on the Nuna TRIV next
What you need
The Nuna TRIV next
The Nuna Pipa Urbn carrier (its car base stays in the car)
The Nuna TRIV next folding car seat ring (in the box) — it comes in the box
Step by step
1Set the ring adapter on the seat mount until it clicks.
2Place the PIPA car seat on the ring until it clicks; it can face rearward or forward.
3Pull up on the car seat to check it is attached to the ring and the ring is attached to the stroller.