Nuna also sells these two together as the Discover the Nuna DEMI next stroller + PIPA urbn travel system with 2 PIPA urbn baseless infant car seats..
This answer is for the Nuna DEMI next.
Key specs
Adapter
In the box
Weight with carrier
33 lb
Seat rated to
30 lb, 29 in
On planes (FAA)
Yes
Stroller folded
L 23.5 x W 24 x H 35 in
Good to know before you click it on
Ring adapter mounts rear- or forward-facing in the upper mount; remove the infant carrier before folding. With the post adapters in the lower mount, close the canopy.
Post adapters: close the stroller canopy when the infant carrier is in the lower mount.
About this pair
The Nuna Pipa Urbn goes on the Nuna DEMI next with the Nuna DEMI next car seat adapters (in the box), which ships with the stroller. With the carrier on, you are pushing about 33 lb (26 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 DEMI next.
Summary from the makers' published data.
How to set up the Nuna Pipa Urbn on the Nuna DEMI next
What you need
The Nuna DEMI next
The Nuna Pipa Urbn carrier (its car base stays in the car)
The Nuna DEMI next car seat adapters (in the box) — it comes in the box
Step by step
1Slide the two pieces of the ring adapter together.
2Place the ring on the upper seat mounts until it clicks.
3Place the car seat on the ring until it clicks; it can face rearward or forward.
Nuna says it needs an adapter (DEMI next car seat adapters (in the box)).
“The PIPA urbn infant car seats pair seamlessly with the DEMI next and redefine travel with a baseless installation, ensuring secure transitions for both babies in seconds.”