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Cosco Topside

The Cosco Topside has a booster weight limit of 100 lb and has an expiration of 10 years, per Cosco. Cosco backless booster listed by the maker as item BC214.

  • $19.99List price
  • 100 lbBooster to
See it on Cosco's site

When does it expire?

All booster seats

Topside: key facts

  • The Cosco Topside works as a booster from 40 to 100 lb and 43.4 to 57 in tall, per Cosco.
  • Outgrown by height: "DO NOT use this booster seat if the top of your child's ears are above the top of the vehicle seat back or headrest. DO NOT use the booster seat if your child's head is less than 5 in. (12.7 cm) below the roof of the car."
  • It installs with vehicle lap/shoulder belt (booster).
  • Cosco says it expires 10 years after the date of manufacture.
  • Cosco says it isn't certified for aircraft.

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

How the Topside 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 limit100 lb44th highest booster limit of 64

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

This one
100 lbmiddle 110 lb120 lb
Expiration10 years

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

This one
6 yearsmiddle 10 years12 years
Price$19.992nd lowest price of 53

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

This one
$19.98middle $79.99$399.99

What sets the Topside apart

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

Next to its closest matches

Flying with the Topside

Cosco's label: “This restraint is not certified for aircraft use, because aircraft seats do not have shoulder belts.” 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

  • Maker lists a 40-100 lbs backless range

Worth checking

  • User guide PDF not opened

Where to buy the Topside

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

Cosco Topside
TypeBooster
List price$19.99
Booster weight40–100 lb
Booster height43.4–57 in
Head ruleDO NOT use this booster seat if the top of your child's ears are above the top of the vehicle seat back or headrest. DO NOT use the booster seat if your child's head is less than 5 in. (12.7 cm) below the roof of the car.
Installationvehicle lap/shoulder belt (booster)
Load legNo
Anti-rebound barNo
RotatesNo
Aircraft labelNot certified for aircraft
Expires after10 years

Compare the Topside with

How each closest rival differs from the Topside, from the makers' specs.

Ask the meadow

Topside: questions answered

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

Can you bring the Cosco Topside on a plane?

Cosco 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.

Topside or Rise LX Booster: what's different?

By the makers' specs, the Rise LX Booster lists for $0.01 less. See every spec side by side.

Is it OK to buy a used Topside?

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