Packaging

So I made these cute little envelopes for shipping the pendants in.  The envelopes are 2.5 x 3.5, and are made from card cardstock.  It keeps the cost of the pendants lower (because I don't have to charge for shipping), and I like that I can make the envelopes myself (hooray for homemade!), but I'm trying to decide if the packaging is TOO minimalist.  For one thing, I don't think I can add tracking to them if I'm just using a stamp to ship them, and I wonder if a customer would be worried about damage?

Opinions, anyone?

The Abysmal USPS

I just want to express a little negativity right now.  I'll make it quick.

The Post Office is completely ridiculous.  It took them over three weeks to deliver a package (it was supposed to be 2-3 days), and when it finally arrived, the box was empty.  They stole the item out of the package.  How 'bout that?

I'm shipping UPS from now on, they are WAY more reliable!!

This is the tame version of my rant, of course -- the other one employs many more expletives.

Okay, I'm done.