Safety 1st All-in-One SportPrice: $120.

Type: Convertible, five-point harness.

Limits: 5 to 35 lbs. rear-facing, 22 to 50 lbs. front-facing, 40 to 100 lbs. as a booster.

NHTSA Ease of Use Rating: Not Available.
Older model ratings: Rear-facing: Three out of five stars.
Forward-facing: Three out of five stars.
Booster mode: Four out of five stars.

IIHS rating for booster mode: Not recommended.

Pros: It’s an infant seat! It’s a convertible! It’s a booster!

Cons: Twisty straps. Poor recline. And much more!

Comments: The Safety 1st All-In-One Sport convertible car seat has been sold under a zillion aliases, as you’d expect from Cosco. It was marketed under the Eddie Bauer, Safety 1st, Cosco and Alpha brands in a variety of price points and spin-offs. Now it appears to be available only in the Safety 1st version.

The pitch for this seat is simple: you can use it from birth to college. Ok, perhaps not college, but this seat aims for a triple play: rear-facing for infants up to 35 lbs., as a convertible with five-point harness up to 50 lbs. . . . and then as a belt-positioning booster up to 80 lbs. for toddlers and older kids.

The problem: it just doesn’t live up to the hype. It is poorly designed, hard to use and expensive. Our reader feedback hasn’t been kind to this seat: readers knock the instructions as “vague and confusing,” the belts are hard to adjust in the rear-facing mode and the straps are so thin they constantly get twisted and snagged. Yet another problem: the highest harness slot in this seat (14.5”) is a full inch lower than other seats like the Britax Roundabout. Why is this a problem? That low slot means some parents will be forced to convert this seat to booster mode too soon for larger children.

As for safety, this seat scored better in crash tests with the harness than in booster mode. (Consumer Reports gave it a “fair” rating in booster mode). The Insurance Institute says this seat is not recommended in booster mode.

Bottom line: the basic design and technology of this seat is about ten years old and is showing its age, in our opinion. We’re disappointed that this seat doesn’t have EPS foam or side impact protection.

Rating: D