Anyone knows what's a 'business reply envelope?'?

Question

I'm getting subscribed to something, and this is put on the form I have to fill in:

Don't forget to enclose a business reply envelope with 2 euro for the stamp'.

Can someone explain to me what to do? I'm new to this, and my English isn't that perfect...

Answer 1

They mean a #10, standard-size envelope, the kind that would neatly hold a sheet of 8.5 x 11 paper (or A4 in Europe) folded in thirds.

Answer 2

a business reply envelope( a number 10) is already addressed and stamped by the business to return mail to them.

it sounds as if they are asking you to send a sase.  which is a number 10 envelope with your address and stamped.

a number 10 envelope is the long one.