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Image: Graco, from gracobaby.com. Colors may differ from the seat you buy. See it on gracobaby.com
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 120 lb, 43 to 57 in.
$189.99on gracobaby.com, as of 2026-10-07 05:48 UTC. Prices change.
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The Graco Nautilus 2.0 is a forward-facing 3-in-1 seat: a 5-point harness for children 26.5 to 65 lb and up to 49 in, then a high-back booster to 100 lb or a backless booster to 120 lb for children 43 to 57 in and at least 4 years old. It lasts 10 years after manufacture.
It suits a family moving a child out of a rear-facing seat that wants one seat through the backless booster stage. It is forward-facing only, and the manual asks for a child at least one year old and 27 in tall for the harness. It installs with hook-style lower anchor connectors or a locked seat belt, with no lock-off, plus the top tether. The Nautilus 2.0 LX has the same limits with InRight LATCH, at 17.4 lb against 17.8 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 10-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 120 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.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
At 19.4 in at its widest, measure your back seat before counting on three across. It weighs 17.8 lb, which matters if you will move it between cars or carry it through an airport.
Kara, Crane.
With LATCH, which is only for a child up to 45 lb, you place the seat forward-facing, pick one of the 4 recline positions, attach the lower anchor connectors and tighten the strap while pressing down in the center. The vehicle's lower anchors must be 11 in apart, center to center. With a seat belt, the connectors clip onto plastic bars, the belt goes through the forward-facing belt path with the orange label, and you lock it, in most vehicles by pulling the shoulder belt all the way out and letting it retract. Both methods add the top tether. At least 80% of the base must be on the vehicle seat, with less than 1 in of movement at the belt path. A lap-only belt may be used in harness mode only.
Source: Graco Nautilus 2.0 manual (PDF)
The manual says children 26.5 to 40 lb who can sit upright unassisted must use the harness, and children 40 to 65 lb should. Straps go at or just above the shoulders, with the tops of the ears below the top of the headrest. You raise or lower the headrest with the adjustment lever, and the harness height moves with it. The buckle strap moves between slots from under the seat, and the chest clip sits at armpit level.
Source: Graco Nautilus 2.0 manual (PDF)
For the high-back booster, you remove the harness from the splitter plate and the T-slots, store the buckle, put the splitter plate on the base, and set the seat in its most upright position. The child is held only by a lap and shoulder belt, with the shoulder belt through the headrest guide and the lap belt low on the hips; never a lap-only belt. Graco allows LATCH in booster mode up to 100 lb if the vehicle maker allows it. For the backless booster, the backrest slides off, the child's ears must be below the top of the vehicle seat back or headrest, and the belt positioning clip is used only if the shoulder belt lies outside the marked zone.
Source: Graco Nautilus 2.0 manual (PDF)
The headrest, backrest and seat pads come off with snaps and elastic loops and are machine washed in cold water on a delicate cycle and drip dried, with no bleach. The buckle is removed from under the seat and swished in a cup of warm water while pressing the red button, without soap and without submerging its strap. The harness, lower anchor strap and tether are surface washed only, because soaking may weaken them.
Source: Graco Nautilus 2.0 manual (PDF)
Each campaign naming this family was read against this model’s numbers and build dates, and none covers it. Still check your seat’s model number and date of manufacture before use, especially on a used seat.
Graco lists the forward-facing harness for 26.5 to 65 lb up to 49 in, the high-back booster for 40 to 100 lb, and the backless booster for 40 to 120 lb. Both booster modes need a child 43 to 57 in tall and at least 4 years old.
Graco Nautilus 2.0 3-in-1 Harness Booster product page (opens in a new tab)
Only with the harness. The manual certifies it for aircraft with the internal harness on forward-facing aircraft seats, installed like the vehicle seat belt method but without the tether. It is not certified as a booster, because aircraft do not have shoulder belts.
The manual says not to use the lower anchors for a child over 45 lb in harness mode; above that, install with the vehicle seat belt and the tether. In booster mode, LATCH may hold the seat up to 100 lb if the vehicle maker allows it.
Graco lists it at 19.4 in wide, 19.7 in deep and 26 in tall, with a product weight of 17.8 lb.
Graco Nautilus 2.0 3-in-1 Harness Booster product page (opens in a new tab)
Graco lists the LX with the same three modes and limits, 19.4 in wide, with InRight LATCH, a 10-position headrest, 4 recline positions and a 17.4 lb product weight.
Graco Nautilus 2.0 LX 3-in-1 Harness Booster product page (opens in a new tab)
The manual says to stop using it and throw it away 10 years after the date of manufacture, shown on a label on the bottom of the seat, and to replace it after any crash.
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 |
|---|---|---|---|---|
| Nautilus 2.0 3-in-1 Harness Booster Car Seat (this seat) | 120 lb | 17.8 lb | 19.4 in | 10 years |
| Tranzitions 3-in-1 Harness Booster | 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 |
| 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 Nautilus 2.0 3-in-1 Harness Booster Car Seat.
| 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 2026-11-01 12:10 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 | 40–100 lb | 43–57 in |
$139.99Eloise 2.0 · Amazon price as of 2026-11-01 12:10 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 2026-11-01 12:08 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 2026-11-01 12:08 UTC, subject to change
