The satchels are more like the crossbody bags, sometimes they are slightly smaller than crossbody bag but they come more specific in the shape.

The crossbody bag are circular or square in the shape but the satchels are rectangular, the crossbody bag have a zip or clasp fastening, but the satchels are with an envelope flap and two buckle fastening.

Except the adjustable straps that can crossbody the satchels also tend to have a short but singular strap on the top, that makes it easy to grab.