The set consists of:

-  a two-part sandwich maker/cutter. To use, make a sandwich with two pieces of soft bread, making sure the filling is in the middle and doesn't extend all the way to the edges of the bread. Put the sandwich in between the two parts, and press hard. You'll get a sandwich that is sealed all around the edges, which can be eaten as-is or lightly toasted in a toaster oven. (You can also try toasting the bread before cutting it if you don't have a toaster oven.) You can also try folding a single slice of bread in half and sealing the edges. 

- a matching sandwich case with a peanut-butter brown bottom part and a white clip-on lid printed with a panda motif, for carrying your pocket sandwich. You can also get a spare case in Blue or Pink here!

By the way, Panda is a pun in Japanese, since the word for bread is 'pan' - so 'pan-da' means 'it's bread'! And sando is Japanese for 'sandwich'. 

There are clear illustrative step-by-step photos on the box. 

Tip: To help the bread edges seal, put the sandwich bread in a plastic bag and microwave on high for a few seconds, to make it slightly moist. 

Dimensions: The carrying case is 100 × 100 × 38 mm (3.9" x 3.9" x 1.5") and can hold 1 to 2 small sandwiches. The cutter parts are 115 × 210 × 44 mm and 110 × 110 × 30 mm respectively.