I had this on Periscope and Twitter today (@OMGChristineB) while I was at the US Post Office. They have great overnight and two-day shipping with envelopes and boxes which are flat rate.

I love recommending these to clients as the small box is only $6.80 (used to be like $5) and you can put whatever you want into these boxes and not worry about weight. They also have two great medium sizes (the heights and widths vary) for around $13. Can't beat it!
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