Graco SlimFit LX 3-in-1
The Graco SlimFit LX 3-in-1 rear-faces up to 40 lb, forward-faces up to 65 lb, and is 19.9 in wide, per Graco.
- 40 lbRear-facing to
- 65 lbHarness to
- 100 lbBooster to
- 21.5 lbSeat weight
SlimFit LX 3-in-1: key facts
- The Graco SlimFit LX 3-in-1 rear-faces from 5 to 40 lb and up to 49 in tall; forward-faces with a harness from 26.5 to 65 lb and up to 49 in tall; works as a booster from 40 to 100 lb and 43 to 57 in tall, per Graco.
- Outgrown by height: "Rear-facing: whose head is at least 1” (2.5 cm) below the headrest adjustment handle. Forward-facing: top of child’s ears must be below top of headrest."
- It installs with LATCH rear-facing, seat belt rear-facing, LATCH forward-facing + top tether, seat belt forward-facing + top tether or booster: vehicle lap/shoulder belt (LATCH optional where vehicle maker allows).
- Graco says it expires 10 years after the date of manufacture.
- Graco lists it as certified for aircraft ("This car seat is certified for use in aircraft when using the harness system. / This car seat is NOT certified for use in aircraft when used as a booster seat because aircrafts do not have shoulder belts.").
- It's 19.9 in wide at the widest point and weighs 21.5 lb.
From Graco's manual and published specs. Always follow the limits on your seat's labels.
How the SlimFit LX 3-in-1 stacks up
Against the 57 all-in-one car seats we track. The shaded band is where the middle half of them fall; the dot is this one.
The same as most all-in-one car seats (10 years).
The same as most all-in-one car seats (40 lb).
Above the typical range for all-in-one car seats (18.3 in to 19.5 in).
Within the typical range for all-in-one car seats (20 lb to 29.3 lb).
What sets the SlimFit LX 3-in-1 apart
Measured against the 57 all-in-one car seats we compare, from each maker's published specs.
- Width: 19.9 inabove the middle half of the 33 all-in-one car seats that publish it (18.3 in to 19.5 in)
- Weight: 21.5 lbin the middle half of the 35 all-in-one car seats that publish it (20 lb to 29.3 lb)
Next to its closest matches
- Graco TrioGrow SnugLockNext to it, the SlimFit LX 3-in-1 is 0.9 in wider; 2.6 lb heavier.
- Cybex Callisto T 360Next to it, the SlimFit LX 3-in-1 is 10 lb lower rear-facing limit; 0.4 in wider; 13.5 lb lighter; no anti-rebound bar (the Callisto T 360 has it); no rotates (the Callisto T 360 has it).
Flying with the SlimFit LX 3-in-1
Graco's label: “This car seat is certified for use in aircraft when using the harness system. / This car seat is NOT certified for use in aircraft when used as a booster seat because aircrafts do not have shoulder belts.” It is 19.9 in wide at its widest point.
What airlines say about car seats:
- American: “Each ticketed customer is allowed 1 stroller and 1 car seat to be checked free of charge” “If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.” Source
- Alaska: “We will transport your child's car seat and stroller free of charge as checked baggage.” Source
- JetBlue: “Checking a child safety seat will not count towards your checked baggage allowance and there is no fee assessed” Source
- Spirit: “One (1) car seat will be accepted per child as checked baggage at no charge.” Source
- Frontier: “strollers and car seats can be checked for free.” Source
- Allegiant: “There is no charge for checking or gate checking one car seat per fare-paying passenger.” Source
- Breeze: “Child seats may be carried on board the aircraft if a seat has been purchased for the Infant or Child” Source
Quoted from each airline's page as of 2026-11-02.
Where to buy the SlimFit LX 3-in-1
Prices and availability change. We may earn a commission from some links.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
- Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Full specs
| Graco SlimFit LX 3-in-1 | |
|---|---|
| Type | All-in-one |
| Rear-facing weight | 5–40 lb |
| Rear-facing height | Up to 49 in |
| Forward-facing weight | 26.5–65 lb |
| Forward-facing height | Up to 49 in |
| Booster weight | 40–100 lb |
| Booster height | 43–57 in |
| Seat weight | 21.5 lb |
| Width | 19.9 in |
| Head rule | Rear-facing: whose head is at least 1” (2.5 cm) below the headrest adjustment handle. Forward-facing: top of child’s ears must be below top of headrest. |
| Newborn insert | Infant Head Support and Body Support (on select models) can be used ONLY for children weighing less than 20 lb (9 kg); body support must be used if shoulders are below the lowest harness setting. |
| Installation | LATCH rear-facing, seat belt rear-facing, LATCH forward-facing + top tether, seat belt forward-facing + top tether, booster: vehicle lap/shoulder belt (LATCH optional where vehicle maker allows) |
| Load leg | No |
| Anti-rebound bar | No |
| Rotates | No |
| Recline positions | 4 |
| Aircraft label | Certified for aircraft, per the maker |
| Expires after | 10 years |
Compare the SlimFit LX 3-in-1 with
How each closest rival differs from the SlimFit LX 3-in-1, from the makers' specs.
- GracoTrioGrow SnugLockrear-facing to 40 lbforward-facing to 65 lb
- 0.9 in narrower
- 2.6 lb lighter
- EvenfloSymphony All-in-Onerear-facing to 40 lbforward-facing to 65 lbCompare side by side
- CybexCallisto T 360rear-facing to 50 lbforward-facing to 65 lb$799.95
- 10 lb higher rear-facing limit
- 0.4 in narrower
- 13.5 lb heavier
- CybexCallisto G 360rear-facing to 40 lbforward-facing to 65 lb$699.95
- 0.4 in narrower
- 13.5 lb heavier
SlimFit LX 3-in-1: questions answered
From Graco's published specs, last checked 2026-11-06.
Does the Graco SlimFit LX 3-in-1 rear-face longer than other all-in-one seats?
15 of the 70 all-in-one seats we track rear-face to a higher weight than its 40 lb. The highest is the Britax One4Life ClickTight All-in-One at 50 lb. NHTSA: stay rear-facing "until he or she reaches the top height or weight limit allowed by your car seat's manufacturer." (NHTSA)
Will the Graco SlimFit LX 3-in-1 fit three across or in a small car?
It's wider than 94% of the all-in-one seats we track, at 19.9 in. The narrowest is the Chicco Fit3x ClearTex Ultra-Slim All-in-One at 16.7 in. Fit depends on your vehicle; check each seat's manual and your vehicle manual. Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.
Can you bring the Graco SlimFit LX 3-in-1 on a plane?
Yes, Graco lists it as certified for aircraft; look for the red-lettered label that says so. The FAA asks that a car seat go in a window seat so it doesn't block the aisle, and the crew will look for that label. It weighs 21.5 lb to carry through the airport.
Is it OK to buy a used SlimFit LX 3-in-1?
NHTSA publishes guidance on used car seats on its car seat page. Graco lists a lifespan of 10 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More all-in-one car seats
- RömerNexa All-in-Onerear-facing to 50 lbforward-facing to 65 lb$749.99
- CybexCallisto G 360 Selectrear-facing to 40 lbforward-facing to 65 lb$649.95
- NunaEXEC nextrear-facing to 50 lbforward-facing to 65 lb$720
- Maxi-CosiAndi 360rear-facing to 40 lbforward-facing to 65 lb$499.99
- Maxi-CosiSelarear-facing to 40 lbforward-facing to 65 lb$449.99
- JoiePepper Spin SI Rotating 4-in-1rear-facing to 40 lbforward-facing to 65 lb$449.99
Where these specs come from
Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.