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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Price on Amazon.com as of 2026-11-02 21:52 UTC, and subject to change.
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.
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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
The Graco Tranzitions 3-in-1 is a forward-facing harness booster for children 26.5 to 65 lb, up to 49 in and at least 1 year old. It then becomes a highback or backless booster from 40 to 100 lb and 43 to 57 in for children at least 4. It never faces the rear and expires 7 years after manufacture.
It suits a child who has outgrown rear-facing and a family that wants a light seat: Graco lists it at 14 lb. The trade-offs are a 7-year life, an 8-position headrest and a backless mode that stops at 100 lb. The Nautilus 2.0 has the same harness limits, and Graco lists it with a 10-year life, a 10-position headrest, 4 recline positions and a backless booster to 120 lb.
A research summary of Graco’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
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.
| 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.
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.
Eloise, Cinder, Marley, Proof.
In harness mode the seat faces forward in the back seat, with the lower anchor attachment or vehicle belt through the belt path with the orange label. Attach and tighten the tether. Do not use LATCH for a child over 45 lb, and never attach two LATCH hooks to one vehicle lower anchor bar. The seat should not move more than 1 in at the belt path. Harness straps go even with or just above the shoulders, the chest clip at armpit level, and the top of the ears below the top of the headrest. The manual warns against bulky coats under the harness.
For booster mode you loosen the harness and remove the straps from the metal splitter plate behind the seat. The lap belt runs low on the hips, in front of the armrest in the booster's belt path, and the shoulder belt sits between the neck and the edge of the shoulder. Never use a lap-only belt. LATCH can hold the booster in place up to 100 lb only if the vehicle manufacturer allows it. For the backless booster, remove the back support and store it with the harness straps. The front of the booster must not hang over the vehicle seat.
The manual says to refer to the seat pad care tag. Removing the headrest cover or seat cover means taking out the harness and buckle strap first; the seat cover also unsnaps from the seat back. Machine wash covers in cold water on a delicate cycle and drip-dry, without bleach. The harness and lower anchor strap are surface wash only with mild soap; do not immerse them. Clean the buckle in warm water without soap or lubricant. Stop using the seat and throw it away 7 years after the date of manufacture.
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.
Harness mode is 26.5 to 65 lb and 49 in or less, for a child at least 1 year old. The highback and backless boosters are both 40 to 100 lb and 43 to 57 in, for children at least 4.
No. Graco lists only a forward-facing harness from 26.5 to 65 lb, then highback and backless booster modes.
Graco Tranzitions 3-in-1 Harness Booster product page (opens in a new tab)
Graco's specifications list a product weight of 14 lb and, separately, a car seat weight with base of 20 lb. It is 19 in wide, 17.4 in deep and 26.5 in tall.
Graco Tranzitions 3-in-1 Harness Booster product page (opens in a new tab)
It is certified for aircraft only with the internal harness, on forward-facing aircraft seats, without the top tether. It is not certified as a booster because aircraft have no shoulder belts.
The Nautilus 2.0 has the same 26.5 to 65 lb harness mode, but Graco lists its backless booster to 120 lb, a 10-position headrest, 4 recline positions and 10 years of use. Graco lists it at 17.8 lb.
Graco Nautilus 2.0 3-in-1 Harness Booster product page (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| 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 |
Other harness-to-booster seats whose published weight and height limits overlap the Tranzitions 3-in-1 Harness Booster.
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$189.99Price on gracobaby.com as of 2026-10-07 05:48 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$219.99Hex 2.0 · Amazon price as of 2026-11-02 21:52 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harnessfrom 2 years | 30–65 lb | 35–49 in |
| Belt-positioning booster | 40–120 lb | 44–63 in |
$359.99Cool Flow Gray · Amazon price as of 2026-11-02 21:50 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harnessfrom 2 years | 30–65 lb | 35–49 in |
| Belt-positioning booster | 40–120 lb | 44–63 in |
$239.99Mod Black · Amazon price as of 2026-11-02 21:50 UTC, subject to change
