The Mercedes-Benz 300 has 42 cu ft of cargo space. In practice that is 7 checked suitcases, or 21 carry-ons, or about 33 supermarket bags. A folded pushchair fits. Against 238 cars with a similar-sized cabin it sits above the average of 19.9 cu ft.
What actually fits in a 300
Cubic feet are an abstraction. Here is the same number in things people actually load, with a packing allowance — a boot is not a cube, and corners go to waste.
| What you are loading | How many fit | Each item |
|---|---|---|
| Checked suitcases | 7 | 27 × 21 × 14″ — 4.6 cu ft |
| Carry-on cases | 21 | 22 × 14 × 9″ — 1.6 cu ft |
| Supermarket bags | 33 | about 1 cu ft each |
| Golf bags | 6 | full set, about 5 cu ft |
| Folded pushchair | Fits | about 6 cu ft |
Counts assume 80% usable volume: luggage does not tessellate, and a wheel arch eats the rest.
Cabin or boot — where the space went
Every car is a fixed envelope, and designers decide how to split it between people and things. The share below is the honest way to compare an estate with a coupé of the same footprint.
| Space | Volume | Share of total |
|---|---|---|
| Passenger cabin | 112 cu ft | |
| Cargo area | 42 cu ft | |
| Total interior | 154 cu ft |
A quarter or more given to luggage — this car is built to carry things.
Against cars with a similar cabin
Compared with 238 models whose passenger space is within eight cubic feet — a fairer group than marketing classes, which put an estate and a coupé in the same bracket.
| Measure | This car | Similar cars | Difference |
|---|---|---|---|
| Cargo volume | 42 cu ft | 19.9 cu ft | +22.1 cu ft |
| In checked suitcases | 7 | 3 | +4 |
Cars with the same room
Closest matches by cargo volume — useful when the boot is the deciding factor and the badge is not.
Boot space is one number. Buying is a longer list.
- Check a VIN for recalls, complaints and its exact build
- Exact value for that car, adjusted for its mileage
- The original window sticker and factory options
- Full research report as a PDF you can hand to a mechanic
- No ads, on every page
- No ads, no tracking — and much more
How we count
Cargo and passenger volumes come from EPA interior-volume records — the same figures manufacturers file for the window sticker, measured to a standard method rather than claimed in a brochure.
The luggage counts are ours. We assume 80% usable volume, because a boot is not a cube: wheel arches, a sloping tailgate and the shape of the cases themselves waste the rest. Suitcase sizes are the airline standards — 22 × 14 × 9″ for carry-on, 27 × 21 × 14″ for checked. Numbers are deliberately conservative; if we say four cases fit, four cases fit.
Related tools
Frequently asked questions
How much cargo space does the Mercedes-Benz 300 have?
42 cu ft behind the rear seats, plus 112 cu ft of passenger cabin.
How many suitcases fit in a 300?
About 7 checked cases (27 × 21 × 14″) or 21 carry-ons, allowing for the fact that a boot is not a perfect cube.
Will a pushchair fit in a 300?
Yes — a folded pushchair takes roughly 6 cu ft and this car has 42, so it fits with room for shopping.
Is that a lot for this size of car?
Compared with 238 cars of a similar cabin size, it is above the average of 19.9 cu ft.