The Nuna Flex System Frame & PIPA Ring Adapter in Caviar transforms any PIPA series infant car seat into a fully functional stroller in seconds — no base, no bulk, no compromise. At just 11.2 lbs with the ring adapter attached, this carbon fiber reinforced frame is road-tested in our boutique and built for families who move fast through every rideshare, terminal, and neighborhood run.
A Frame Engineered for Modern Families
The carbon fiber reinforced aluminum frame delivers an impressive strength-to-weight ratio, with a unique weave pattern that creates a visually striking modern aesthetic. The frame folds with the car seat ring adapter attached and stands on its own when folded, while a height-adjustable 3-position pivoting handle ensures comfortable strolling at any height. All-wheel suspension and large puncture-proof tires handle any terrain with ease, and a quick-engaging 1-touch rear-wheel braking system provides scuff-free security at every stop.
Storage, Comfort & Premium Details
A large basket holds up to 22 lbs of essentials, with a dedicated tracking device pocket to keep tabs on your gear wherever you go. A luxe leatherette-accented push bar and carbon fiber reinforced carry handle add a refined finish, while an included carry bag makes hands-free transport effortless during travel. The frame is compatible with the SWIV™ & TRIV™ series bassinet, any PIPA series car seat, and the Flex system seat — making it one of the most versatile frames in the Nuna lineup.
Dimensions & What’s Included
The Flex System Frame opens to 37"L × 21.5"W × 43.5"H and folds to a compact 23"L × 21.5"W × 29.3"H. Frame alone weighs 8.5 lbs; frame with adapter weighs 11.3 lbs. Supports up to 50 lbs when used with the Flex system seat. Every purchase includes the stroller frame and folding ring adapter. PIPA series infant car seat, Flex system seat, and accessories sold separately.
Complete your setup with a compatible Nuna PIPA series infant car seat or browse our stroller accessories at Posh Baby.
Posh Baby is a family-owned Portland boutique specializing in premium baby gear since 2006. Enjoy Tax-Free shopping in most states.
Build Your Baby Registry at Posh Baby
Create your universal baby registry with Posh Baby Portland — and add items from any store in the world. Our expert registry concierge team is here to guide you through every product category, from strollers and car seats to nursery furniture and essentials. Enjoy exclusive registry rewards, tax-free savings in most states, and the confidence of buying from a family-owned boutique that truly knows baby gear.
Universal Baby Registry
When you register with Posh Baby, you can add gifts from our store, Etsy, Amazon, Target, or that little boutique you love — shop small, shop anywhere. Add items regardless of whether your favorite stores even have a website. Our easy-to-manage registry has no limits on what you can add.
One registry. Every store. Endless possibilities.
Boutique Services Offered
Free Car Seat Install
Education Driven Experience
Try Before You Buy
Free Stroller Assembly
Shop tax-free in most states** **exceptions may apply
Loyalty Rewards
1 Point for Every $1 Spent
Earn loyalty points for purchases and other actions, then turn those points into real rewards. We believe in rewarding the families who choose to support us — we don't take your trust for granted.
Thank you for shopping small.
Registry Rewards
Purchase any 3 of the items below — whether you buy them yourself or your guests do — and receive a 5% rebate gift card based on the total of those 3 items. Use it in-store or online.
Mattress Nursing Chair Bassinet Car Seat Stroller Carrier Bouncer
Eligible items must be purchased from Posh Baby. Gift card is issued after qualifying purchases are confirmed.
