This answer is for the UPPAbaby Cruz (2015–2019), though one maker didn't say which version. Not sure which Cruz you have?
Key specs
Weight with carrier
31.4 lb
Stroller folded
22 W x 14 L x 37 H in (seat attached)
About this pair
The UPPAbaby Mesa (original) attaches straight to the UPPAbaby Cruz (2015–2019); there is nothing extra to buy. With the carrier on, you are pushing about 31.4 lb (21.5 lb stroller, 9.9 lb carrier).
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32 other infant seats fit the UPPAbaby Cruz (2015–2019); UPPAbaby Aria V2, UPPAbaby Mesa Max, UPPAbaby Mesa V2 and 1 more need no adapter at all.
Summary from the makers' published data.
How to set up the UPPAbaby Mesa (original) on the UPPAbaby Cruz (2015–2019)
What you need
The UPPAbaby Cruz (2015–2019)
The UPPAbaby Mesa (original) carrier
The UPPAbaby carrier attaches straight to the stroller frame; the manuals below show exactly where.
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 clicks right in, without saying which version.
“The MESA carrier directly attaches to VISTA and CRUZ strollers, with no adapters needed. … The MESA can be used parent-facing or forward-facing on all three strollers.”