I'm still 7 months out from my wedding date but I want to start looking at invites. I'm going to need at least 175 and I'm worried about the extra postage that some invites require (for extra pockets, or cards inside that make them heavier?) and I've also heard that some sizes (like the oblong tealength) require more postage as well. Has anyone encountered this? Which "style" is the best to choose to try to avoid extra postage? I want to make an educated choice so I won't go way above budget for postage to mail these things.