Choose the size from what you actually carry, not from how the bag looks on a model. As a rule: a phone and a card fit a bag around 20 cm wide, a phone plus wallet, keys and sunglasses want 23 to 27 cm, and anything with a notebook in it needs 30 cm or more. Depth matters as much as width — 7 cm is a slim bag, 17 cm holds a day.
What size crossbody bag do I need?
Empty your current bag onto a table and measure the largest thing in the pile. That is your minimum width. Then decide whether you want the bag to close comfortably over that or to be full when it does.
For reference, from bags in this collection: the phone crossbody is 20 cm tall, 13 cm wide and 3 cm deep — phone, card, key. The royal blue flap satchel is 16 x 23 x 7 cm, which takes a phone, a small wallet and sunglasses. The cognac sling is 27 cm tall and 7 cm deep, which is a different shape holding a similar amount.
How long should a crossbody strap be?
Long enough that the bag sits where you want it and short enough that it does not swing. Most people want the body of the bag at the top of the hip, which for an average adult means a strap drop of 55 to 60 cm.
An adjustable strap matters more than an exact number, because the same bag worn over a coat needs several centimetres more than it does over a shirt.
Does a bigger bag always hold more?
No, and this is the mistake worth avoiding. A wide flat bag with 5 cm of depth holds less than a narrower bag with 12 cm, because volume is three-dimensional and the number people compare is usually width alone.
A structured bag also holds less than its measurements suggest and a soft one holds more, because the soft one gives. That is why an unstructured hobo often takes more than a rigid satchel of the same stated size.
Crossbody or shoulder?
Crossbody distributes the weight across your back and keeps your hands free, which is why it wins for travel and for a full day out. Shoulder carry is faster to take on and off and reads less casual.
Most bags here have an adjustable strap so they do both, which is usually the more useful answer than committing to one.

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