What the picture can tell you
MacBook Air 13-inch (M4, 2025)
- Width
- 304.1 mm
- Depth
- 215 mm
- Height
- 11.3 mm
A familiar A4 sheet helps explain a laptop’s footprint. A bag that holds A4 paper does not necessarily hold the laptop. This picture does not certify compatibility with any particular bag.
A practical measurement sequence
- Close the laptop and measure width, depth and thickness with any case or cover you use.
- Measure the usable interior of the laptop compartment, not the bag’s external dimensions.
- Check the narrowest part of the fully opened zip and the shape of its corners.
- Account for padding, dividers and changes caused by other contents.
- Check that you can insert and remove the laptop without forcing it.
Why a flat comparison is not enough
Thickness, rounded corners and the opening can change the result even when width and depth appear suitable. Prefer the bag maker’s model compatibility information or a physical fitting check. Appropriate clearance depends on the structure and material, so there is no single extra margin that applies to every bag.