Hotel packed lunch content and price

We have the option to purchase packed lunches from our hotel for CHF 12.50 per person per day (although this is reduced by 10% if paid in advance) does anyone know the typical content/size of a hotel packed lunch - will they feed my hungry teenagers?! How might this compare to picking up lunches from a Co-op/Frischmarket etc or buying lunches in villages etc? Basically is it worth doing?

Sorry just noticed that the forum is entitled Swiss rail forum, if someone could move this to a more suitable place I would be grateful!

No one on the forum can tell you what the hotel you have chosen will put in your lunch boxes. Suggest you ask the hotel.

The price seems very reasonable.