Trail notes

What Size Roof Bag Do I Need?

Measure twice, buy once. The sizes, the roofs and the trips they suit.

Measure your roof

Measure the flat part of the roof front to back and side to side, between the door frames. That's the number that matters, not the car's length.

Bag	Full size	Roof needed	Good for
15 cu ft	44 × 34 × 17 in	Over 50 × 36 in	Sedans, compacts, 2–3 people
16 cu ft	Midway	Small SUVs	Crossovers, weekends
20 cu ft	40 × 52 in footprint	Midsize SUVs	Families of four
21 cu ft	52 × 40 × 18 in	Over 58 × 42 in	Big families, long trips
22 cu ft	Our largest	Long, wide roofs	Moves, holiday hauls

Bag

Full size

Roof needed

Good for

15 cu ft

44 × 34 × 17 in

Over 50 × 36 in

Sedans, compacts, 2–3 people

16 cu ft

Midway

Small SUVs

Crossovers, weekends

20 cu ft

40 × 52 in footprint

Midsize SUVs

Families of four

21 cu ft

52 × 40 × 18 in

Over 58 × 42 in

Big families, long trips

22 cu ft

Our largest

Long, wide roofs

Moves, holiday hauls

A bag that overhangs the windshield is noisier and harder to strap square. A snug fit on the roof beats an extra cubic foot.