Yes, the flat rate boxes are very convenient. The one which is shaped like a shoe box works well for candles. The other one is more for stuff like t-shirts. If you are only sending a couple of candles, you wouldn't want to do the flat rate box though, in which case a regular priority mail box would do. I have an assortment of boxes, and find the best sizes are: FRB1 (the flat rate box), #4 (slightly smaller than FRB1), 1096L (suitable for 8-10 votives), and #7 (larger than FRB1). If you have an account setup with USPS, you can use it to order boxes for free and pay for your postage online. If you do not have an account with them (I don't), you can still order boxes for free and print your mailing label without postage online. I did not arrange for pickup because I live only a couple of blocks from the post office, but I think arranging for pickup should not be a problem.