Ok, as it seems speaker swapping/selling/testing has become more popular, there are lots of you out there shipping speakers to find what you like. Here are some pointers on how to avoid a damage claim. I've shipped about 17,000 speakers now, and have had only 12 damage claims in six years. That's probably due to how I pack speakers for shipment via USPS or Fedex. And while nothing is foolproof, 12 out of 17,000 ain't too shabby an average. Let's start with the outside box you'll ship a single speaker in. I use a Uline box, 16x8x16 inches, box # S-4393. You can buy these for $3-4 at most box stores. The next thing you need to do is to fill up the box about 5 inches deep with newspaper. Yes, five inches, since it will get compressed to 2 inches deep by your 11-12 pound speaker box. Place your original speaker box in the first box, magnet up, frame down. This is one of my old speaker boxes, it's about 15 inches across, and 6 inches deep. That leaves a 1/2 inch on each side for newspaper, which you're going to overstuff. Notice how the outside box bulges now? You want that bulge so that you can provide some give for impacts/dings from other boxes it will be shipping next to...or rough handling. Then you're going to put in another 2 inches of newspaper on top of the box, and compress that down by closing the box and pressing it together from the sides, and down from the top. Notice how the top looks like it's bulging upward? You want that, as it will get compressed during shipping. Then you'll tape up all available flaps and edges. At this point you have a 12 inch speaker with 2 inches of cardboard/newspaper, and the original box around it on the sides, and about 1.5 inches top and bottom. If you have Celestion speakers you are shipping, the worst thing you can do is to trust their single flap box. Their speakers are shipped on boxed pallets to places like GC, they don't get handled individually. You need to double box their original boxes, or you will be sorry (and filling out damage claims), and refunding the buyer's money. Been there, got the T-shirt, it's a grease rag now, OK? Next...do not write FRAGILE on your box, unless it's the USPS you're shipping with. UPS and Fedex handlers love to see that, and treat boxes like crap when they do. Sorry, I've tested that theory to destruction (literally) many times. You'll want to insure it for the sale price so you're covered for loss/theft/damage, too. Be advised that single speaker shipping costs have gone up as shipping companies have had more damage claims filed (big surprise, right?), and it's likely going to cost $20-25 to ship a single speaker as a consumer. Even with my Fedex account discount (and 90-120 shipments per month), it's costing me around $18-23 per shipment, not including the outside box, and newspaper, tape, time, gas, etc. But it sure beats the crap out of damage claim paperwork. So there you go! If you're doing two speakers, get the 16x16x16 inch box, Uline part #: S4166, which costs around $4-5 at most box stores. Good luck!