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Baby Trend Koa Slim High Back Booster

The Baby Trend Koa Slim High Back Booster weighs 9.8 lb, has a booster weight limit of 120 lb, and has an expiration of 9 years, per Baby Trend. A slim high-back booster with built-in side sun shields, a folding backrest and flip-up armrests that also works as a backless booster.

  • $79.99List price
  • 120 lbBooster to
  • 9.75 lbSeat weight
See it on Baby Trend's site

When does it expire?

All booster seats

Koa Slim High Back Booster: key facts

  • The Baby Trend Koa Slim High Back Booster works as a booster from 40 to 120 lb and 44 to 57 in tall, per Baby Trend.
  • Outgrown by height: "DO NOT use this Booster Seat when top of child's ears are above the top edge of seat back."
  • It installs with LATCH (keeps seat in place when empty).
  • Baby Trend says it expires 9 years after the date of manufacture.
  • Baby Trend says it isn't certified for aircraft.

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

How the Koa Slim High Back Booster stacks up

Against the 65 booster seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Booster weight limit120 lbHighest booster limit of 64 booster seats

Within the typical range for booster seats (100 lb to 120 lb).

This one
100 lbmiddle 110 lb120 lb
Expiration9 years

Within the typical range for booster seats (8 years to 10 years).

This one
6 yearsmiddle 10 years12 years
Weight9.8 lb22nd lightest of 42

Within the typical range for booster seats (6 lb to 13.2 lb).

This one
1.8 lbmiddle 9.8 lb20.9 lb
Price$79.9924th lowest price of 53

Within the typical range for booster seats ($55.99 to $159.99).

This one
$19.98middle $79.99$399.99

What sets the Koa Slim High Back Booster apart

Measured against the 65 booster seats we compare, from each maker's published specs.

  • Weight: 9.8 lbin the middle half of the 42 booster seats that publish it (6 lb to 13.2 lb)

Next to its closest matches

Flying with the Koa Slim High Back Booster

Baby Trend's label: “This restraint is not certified for aircraft use, an aircraft does not have a combination lap and shoulder belt.” American lists “Booster seats with no approval label or shoulder harness” under seats and devices not approved for use on board (source).

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.

Listed features

  • Slim profile
  • Folding backrest for storage
  • Built-in side sun shields

Worth checking

  • High-back limit is 100 lb vs 120 lb backless

Where to buy the Koa Slim High Back Booster

Prices and availability change. We may earn a commission from some links.

good to know
  • 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

Baby Trend Koa Slim High Back Booster
TypeBooster
List price$79.99
Booster weight40–120 lb
Booster height44–57 in
Seat weight9.75 lb
Head ruleDO NOT use this Booster Seat when top of child's ears are above the top edge of seat back.
InstallationLATCH (keeps seat in place when empty)
Load legNo
Anti-rebound barNo
RotatesNo
Aircraft labelNot certified for aircraft
Expires after9 years

Compare the Koa Slim High Back Booster with

How each closest rival differs from the Koa Slim High Back Booster, from the makers' specs.

Ask the meadow

Koa Slim High Back Booster: questions answered

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

Can you bring the Baby Trend Koa Slim High Back Booster on a plane?

Baby Trend doesn't list it as certified for aircraft, so it can be checked as luggage but not used in the plane seat. See seats approved for planes.

Is it OK to buy a used Koa Slim High Back Booster?

NHTSA publishes guidance on used car seats on its car seat page. Baby Trend lists a lifespan of 9 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 booster seats

Where these specs come from

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