ComparisonCar Booster Seats
Which booster seat is the better pick?
Cosco Topside Backless Booster Car Seat
Best budget — lowest price for a federally compliant booster
VS
Diono Solana, No Latch, Single Backless Booster Car Seat
Best slim profile — fits 3 across in most vehicles
Specs Comparison
| Feature | Cosco Topside | Diono Solana |
|---|---|---|
| Type | Backless Booster | Slim Backless Booster |
| Weight Range | 40–100 lbs | 40–120 lbs |
| Height Range | 40–57 inches | 40–57 inches |
| Seat Weight | 3.5 lbs | 4 lbs |
| LATCH System | No | No |
| Cup Holders | Yes — built-in cup holder | No — slim design (cup holder accessory available) |
| Machine Washable | Spot clean only | Yes |
| Price Range | $ | $ |
Cosco Topside
Strengths
- Lowest price booster seat that meets federal standards
- Lightest in this roundup at 3.5 lbs
- Compact and easy to store or transfer
- Built-in cup holder
- Great as a spare for carpools or grandparents
Weaknesses
- Minimal padding — uncomfortable on long trips
- Spot clean only (not machine washable)
- No LATCH system
- Basic construction
Diono Solana
Strengths
- Slimmest profile for fitting 3 car seats across
- High weight limit (120 lbs)
- Machine-washable cover
- Lightweight and easy to transfer
- Diono safety reputation
Weaknesses
- No cup holders (accessory sold separately)
- No LATCH system
- Minimal padding on slim design
The Pragmatic Pick: Cosco Topside
In this head-to-head, Cosco Topside gets the nod. While both are solid choices, Cosco Topside stands out with lowest price booster seat that meets federal standards and lightest in this roundup at 3.5 lbs. Diono Solana counters with slimmest profile for fitting 3 car seats across, which may matter more to some families. But on balance, Cosco Topside delivers a more compelling overall package for the typical parent.
← Back to Best Car Booster Seats (2026)
Other Comparisons
- Graco TurboBooster 2.0 vs Britax UpNGo Click
- Graco TurboBooster 2.0 vs Cosco Topside
- Graco TurboBooster 2.0 vs Evenflo GoTime
- Graco TurboBooster 2.0 vs Diono Solana
- Graco TurboBooster 2.0 vs Chicco GoFit Plus
- Britax UpNGo Click vs Cosco Topside
- Britax UpNGo Click vs Evenflo GoTime
- Britax UpNGo Click vs Diono Solana
- Britax UpNGo Click vs Chicco GoFit Plus
- Cosco Topside vs Evenflo GoTime
- Cosco Topside vs Chicco GoFit Plus
- Evenflo GoTime vs Diono Solana
- Evenflo GoTime vs Chicco GoFit Plus
- Diono Solana vs Chicco GoFit Plus
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