# Diono 2-in-1 Booster Seat, 40–120 lbs.

Make buckling in and napping more comfortable with the Diono Connect3 RXT booster, its under-17-inch width doesn’t guarantee a three-across fit.

- [Original product page](https://www.ofertitastop.com/us/product/diono-in-booster-seat-40-120)
- Market: US
- Language: en-US
- Currency: USD
- Product updated: 2026-10-12T13:49:10.451Z
- Category: Baby & Toddler > Baby Transport > Baby & Toddler Car Seats
- Source store: amazon US
- Active deal: Yes
- Price: 127.99 USD
- Previous price: 159.99 USD
- Rating: 4.6 / 5
- Reviews: 322

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

If fitting more than one booster across a back seat matters, a slim design may be more useful than extra bulk, if comfort and adjustability matter more, the Diono Connect3 RXT also brings a reclining backrest and an adjustable headrest. It’s less than 17 inches wide, but that doesn’t guarantee a three-across fit in every sedan or SUV. The design is intended for children from 40 to 120 lbs. and can switch from high-back to backless mode as needs change.

## Getting the most from it
The EasyPath lap belt guides and contoured seat are designed to make reaching the buckle easier, which can help during the everyday routine of getting a child settled and buckled in. A carabiner helps keep the shoulder belt in place. For a school pickup, that combination means less fumbling around the side of the seat when it’s time to buckle up. The headrest and backrest adjust to 11 positions, while the backrest also has two recline positions. The SleepyCheek headrest is shaped to support a child’s head and neck during a nap, and the 2TexFoam seat base is intended to add cushioning.

The front-access LATCH straps have easy-release connectors, and a built-in carry handle makes moving the booster more manageable. If you need a backless booster later, the Connect3 RXT converts to that mode. It’s a great fit if you want one seat that can adapt between high-back and backless use. If you prioritize a straightforward, lightweight booster that’s easy to transfer, the carry handle and front-access release are useful details, if you prefer a fixed, no-conversion design, those features may matter less.

## Why it’s worth it
The appeal here is the combination of a narrow profile with comfort and adjustment features, rather than a booster built around just one of those priorities. That could make sense for a family trying to leave room for other passengers in a mid-sized vehicle while still giving a child head and back support. The belt guides, buckle access and shoulder-belt carabiner also address small but frequent hassles that can make getting in and out of the car feel less smooth.

There are tradeoffs. A slim seat is not proof that three boosters will fit safely across a particular vehicle’s back seat, and this description doesn’t provide vehicle-specific fit information. It may not suit you if you need a guaranteed three-across arrangement or want confirmed fit guidance for your exact car. Check the booster’s fit in your vehicle before relying on that layout.

## The essentials
The Connect3 RXT is a 2-in-1 high-back booster that can convert to backless mode and is listed for children from 40 to 120 lbs. Its stated width is less than 17 inches. Other listed features include 11 head-and-backrest positions, a two-position reclining backrest, EasyPath lap belt guides, a shoulder-belt carabiner, front-access LATCH straps, a carry handle and a 2TexFoam seat base. On the spec sheet, it covers several comfort and adjustment needs, but the description does not give specific vehicle fit results or dimensions beyond its width.

## Should you buy it?
Choose the Diono Connect3 RXT if you want a booster that can move from high-back to backless use, appreciate adjustable head support, and are considering a slim seat for a mid-sized sedan or SUV. Its features speak to day-to-day buckle access and comfort, not just a narrow footprint. If your decision depends on fitting three seats across, treat that as a vehicle-specific question rather than a guarantee: the listed width alone can’t confirm how the booster will fit beside other seats in your back row.

## Images

![Diono 2-in-1 Booster Seat, 40–120 lbs. — 1](https://www.ofertitastop.com/i/JB3Cp-he_TLEPBr3_5SuKcjTj7vkogNuxK0P3J9LTJwKiZ_O_ENCOO_90IkHC1ruH-xgjTpMtWBZtRNENwRFoAuEGDirLbNnkodEueXLDqEKOkERFqdZZF2nPA.jpg)

![Diono 2-in-1 Booster Seat, 40–120 lbs. — 2](https://www.ofertitastop.com/i/7cLygTQHurY322Pc2SidWvCq36st3DD8GEvsrYRbP9jXdMLRkqj0TK_g8nxksc7sLcakTLkHj9jNjioPw0evlGeyA8jO8fwQHi75hlJJQk_7oYsxgh_OcbzG-A.jpg)

![Diono 2-in-1 Booster Seat, 40–120 lbs. — 3](https://www.ofertitastop.com/i/4B5mJj1bRzMn88NVTUcOohhkKPYsvoYM888c6vVYGLvgF3z7aMBKyf9jJy99QHhIHm0YFrtHJdVm_4qxssqfNFUhBB4cLUgSi1AXO6pAIjOMhcOSLt-HURFg0Q.jpg)

![Diono 2-in-1 Booster Seat, 40–120 lbs. — 4](https://www.ofertitastop.com/i/GhN-JLK4Jiv4pxS43_Fm0z2id9XeVWiNVBQR8Oqtv-deJh4tkJa1JDGWNJ19zX677LsWJeHDPXB6SCpnwsxinNUGoTk_xgi_OLMlevGci3jvCByZjAtO4sqEhQ.jpg)

![Diono 2-in-1 Booster Seat, 40–120 lbs. — 5](https://www.ofertitastop.com/i/YsJTYQhMbxcG0jTRL5THdIRGhAk7owxpknvUxLMCp-0TmR9kc9ME7VCNZzNizugKjlNAMsPRalMSovRbP6mg2ZwZn4CsJHy0u_S4GOqTyaspuBaNCEgI_kIvRw.jpg)