Favor Boxes

I put together one of our favor boxes for the welcome bags & added a sticker - tada! I got the favor boxes from JeanM (www.myjeanm.com) and the label/stickers from My Wedding Labels (www.myweddinglabels.com). I'm planning on filling these with m&ms. :) But I'm trying to decide if I should put the boxes together down here, and fill them up in Michigan so the weather does melt the m&ms in route to MI.