Consider combining some of the information you need to include onto fewer sheets of paper rather than giving each insert its own piece of paper. For example, you could include a map to the reception on the back of the hotel information.
[header] How to save on postage for your wedding invitations [title] Watch your weight. [substeps] The heavier your wedding invitation is, the more it will cost to send. Be careful about your choice of paper as well as the number of inserts you include.