It is flask shaped in plan, as with most ampullae it is fairly flat, although the neck of this example is open. It would have had 2 handles, one on each side but one has broken off. The remaining example shows they were triangular, and placed at the base of the neck. A casting seam can be seen along both edges of the ampulla.

One side of the rounded lower half is decorated with a central shield, with its border raised. Inside the shield is a raised letter, possibly a G. The shield is inside two concentric circles.

The other side of the ampulla is decorated with a scallop shell motif (initially this was the badge oof St James of Compostella, and so the emblem of pilgrimage itself. However later Canterbury took on this motif and itwas also used at many other shrines within Britain.).