The right model. The right proportions.

Pin down the exact model

Record the brand, model name, size designation, and version or year if known. Similar names can refer to different shapes, generations, or materials. A brand’s “small” need not match another brand’s “small”—or even another model from the same house.

Use the brand’s own specifications for the exact version where available, then ask the seller to confirm the actual bag’s measurements. Older, discontinued, and soft-sided bags may differ from current specifications. Do not rely on a catalog field alone.

Five measurements worth asking for

Width

Ask whether it is measured at the base or the widest point. Tapered bags can have a much narrower opening.

Height

Measure the body from base to top, excluding handles. A curved top can reduce usable interior height.

Depth

The front-to-back dimension, usually at the base. A structured bag may offer less flexibility than a soft one.

Opening

The usable space through the zipper or flap. An object may fit the body dimensions but not pass through the opening.

Handle & strap drop

The vertical distance from the top of the bag to the inside of the handle or strap at its peak. Drop is not total strap length; ask for the adjustable range too.

Compare with a bag you already love

Measure a bag that feels comfortable on you, using the same method and units as the listing. Compare body dimensions and strap drop side by side. For reference, one inch equals 2.54 centimetres; avoid comparing inches directly with centimetres.

Lay out your actual phone, wallet, keys, glasses case, and other essentials. For a laptop or tablet, use its measurements with its case—not its screen size. Leave room for the lining, internal pockets, closure, and getting items in and out.

A message to send the seller

“Could you confirm the exact model and size, body width × height × depth, usable opening, and handle or strap drop? Please include the units and measurement points. A photo with a measuring tape would be helpful.”