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Graco Tranzitions 3-in-1 Harness Booster

A harness-to-booster seat with 3 modes: forward-facing harness 26.5 to 65 lb, up to 49 in; high-back booster 40 to 100 lb, 43 to 57 in; backless booster 40 to 100 lb, 43 to 57 in.

At a glance

Fits children from 26.5 to 100 lb
Up to 57 in tall
3 modes: forward-facing harness, high-back booster, backless booster
Seat weighs 14 lb
19 in wide
7-year usable life

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Graco product page Manual

Specifications checked against Graco’s US site and manual on September 17, 2026. Not hands-on tested. How I research

Who the Tranzitions 3-in-1 Harness Booster fits

This seat covers 3 stages, and a child has to meet every limit of the stage they are in. Graco gives it a 7-year life from the date of manufacture, so check the date label before using a hand-me-down.

Forward-facing harness26.5 to 65 lb · Up to 49 in: The child faces forward in the seat’s own harness. Use the top tether every time, and stay in the harness until the child outgrows it.
High-back booster40 to 100 lb · 43 to 57 in · from 4 years: The seat’s own back and belt guide route the vehicle belt across the shoulder, and the sides give the child something to lean on when they sleep.
Backless booster40 to 100 lb · 43 to 57 in · from 4 years: Only the base is left, so the vehicle seat has to support the child’s back and head, and the belt guide sits at the hip.

A school-age child with a backpack beside an empty high-back booster

What are the Tranzitions 3-in-1 Harness Booster weight, height and age limits?

Graco Tranzitions 3-in-1 Harness Booster limits by mode
Mode	Child weight	Child height	Minimum age	Conditions
Forward-facing harness	26.5 to 65 lb	Up to 49 in	Not published	—
High-back booster	40 to 100 lb	43 to 57 in	4 years	At least 4 years old
Backless booster	40 to 100 lb	43 to 57 in	4 years	At least 4 years old

A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.

Tranzitions 3-in-1 Harness Booster specifications

Seat weight: 14 lb
Width: 19 in
Depth: 17.4 in
Height: 26.5 in
Usable life: 7 years
Aircraft use: Not published
Headrest positions: 8
Weight with base as stated: 20 lb

An empty car seat installed on a back seat, seen through an open car door

Will it fit your car?

At 19 in at its widest, measure your back seat before counting on three across. It weighs 14 lb, which matters if you will move it between cars or carry it through an airport.

Check your vehicle manual for lower anchor positions and any head-restraint rules.
Rear-facing seats need front-seat room: try the install behind the driver before you commit.
Aircraft certification is printed on the seat’s own label; check before you fly.

What features does the Tranzitions 3-in-1 Harness Booster have?

8-position headrest
Open-loop belt guides

Colors listed in the US

Eloise, Cinder, Marley, Proof.

Is the Tranzitions 3-in-1 Harness Booster recalled?

No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.

NHTSA recall search · Recent car seat recalls

Before you buy

Weigh and measure your child. The limits above are the manufacturer’s, and a child has to meet all of them for the mode they will use.
Confirm the exact version. Colors, retail exclusives and model numbers change limits more often than you would expect; Graco lists 4 colors of this seat.
Read the manual before you buy, not after. It is linked above and holds the fit rules, the install methods and the expiry.
Check recalls by model number and date of manufacture, and register the seat with Graco so you hear about the next one.

Sources

Other Graco booster seats

Model	Top child weight	Seat weight	Width	Usable life
Tranzitions 3-in-1 Harness Booster (this seat)	100 lb	14 lb	19 in	7 years
Nautilus 2.0 LX 3-in-1 Harness Booster Car Seat	120 lb	17.4 lb	19.4 in	10 years
Nautilus 2.0 3-in-1 Harness Booster Car Seat	120 lb	17.8 lb	19.4 in	10 years
TurboBooster 2.0 Highback Booster	100 lb	9 lb	16.73 in	10 years
TurboBooster 2.0 Backless Booster	100 lb	5.1 lb	—	10 years
TurboBooster 2.0 LX Highback Booster with LATCH System	100 lb	10.76 lb	19.84 in	10 years
TurboBooster 2.0 LX Highback Booster Seat featuring Safety Surround	110 lb	—	—	10 years
TurboBooster LX Backless Booster with LATCH	100 lb	5.56 lb	17.5 in	10 years
TurboBooster Stretch2Fit Booster Seat	110 lb	11.73 lb	19.69 in	10 years