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Evenflo All4One / All4One DLX 4-in-1

The Evenflo All4One / All4One DLX 4-in-1 rear-faces up to 40 lb and forward-faces up to 65 lb, per Evenflo.

DiscontinuedNo longer made or sold new. Specs are kept for comparing generations.

  • 40 lbRear-facing to
  • 65 lbHarness to
  • 120 lbBooster to
See it on Evenflo's site

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All4One / All4One DLX 4-in-1: key facts

  • The Evenflo All4One / All4One DLX 4-in-1 rear-faces from 4 to 40 lb and 17 to 40 in tall; forward-faces with a harness from 22 to 65 lb and 28 to 49 in tall; works as a booster from 40 to 120 lb and 44 to 57 in tall, per Evenflo.
  • Outgrown by height: "Rear-facing: top of child's head (1 in.) or more below the top of child seat headrest."
  • It installs with seat belt rear-facing, LATCH rear-facing, seat belt forward-facing + top tether, LATCH forward-facing + top tether, high-back booster: vehicle lap-shoulder belt or backless booster: vehicle lap-shoulder belt.
  • Evenflo lists it as certified for aircraft ("When used with the internal harness ... certified for use only in passenger and multi-purpose passenger motor vehicles, buses and trucks equipped with either lap belts only or lap/shoulder belt systems and in aircraft. ... In booster mode, this restraint is NOT certified for aircraft use.").

From Evenflo's manual and published specs. Always follow the limits on your seat's labels.

How the All4One / All4One DLX 4-in-1 stacks up

Against the 58 all-in-one car seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Rear-facing limit40 lb11th highest rear-facing limit of 58

The same as most all-in-one car seats (40 lb).

This one
40 lbmiddle 40 lb50 lb

Flying with the All4One / All4One DLX 4-in-1

Evenflo's label: “When used with the internal harness ... certified for use only in passenger and multi-purpose passenger motor vehicles, buses and trucks equipped with either lap belts only or lap/shoulder belt systems and in aircraft. ... In booster mode, this restraint is NOT certified for aircraft use.”

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 All4One / All4One DLX 4-in-1

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good to know
  • Discontinued. You may still find it used or on clearance.
  • 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

Evenflo All4One / All4One DLX 4-in-1
TypeAll-in-one
Rear-facing weight4–40 lb
Rear-facing height17–40 in
Forward-facing weight22–65 lb
Forward-facing height28–49 in
Booster weight40–120 lb
Booster height44–57 in
Head ruleRear-facing: top of child's head (1 in.) or more below the top of child seat headrest.
Installationseat belt rear-facing, LATCH rear-facing, seat belt forward-facing + top tether, LATCH forward-facing + top tether, high-back booster: vehicle lap-shoulder belt, backless booster: vehicle lap-shoulder belt
RotatesNo
Aircraft labelCertified for aircraft, per the maker

Compare the All4One / All4One DLX 4-in-1 with

How each closest rival differs from the All4One / All4One DLX 4-in-1, from the makers' specs.

Ask the meadow

All4One / All4One DLX 4-in-1: questions answered

From Evenflo's published specs, last checked 2026-11-06.

Does the Evenflo All4One / All4One DLX 4-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)

Can you bring the Evenflo All4One / All4One DLX 4-in-1 on a plane?

Yes, Evenflo 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.

Is it OK to buy a used All4One / All4One DLX 4-in-1?

NHTSA publishes guidance on used car seats on its car seat page. 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

Where these specs come from

Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.