I would never trust a packing company for something heavy. I got screwed several times. One UPS store shipped an amp and cab back to back in the same box with packing peanuts. Wrecked and delivered torn open with no packing peanuts left. I've had the UPS guys dump amps out of the back of the truck. I usually meet them so this doesn't happen, but the boxes are usually all wrecked by that point anyhow. Most people can't pack worth a damn. I always double box. I have found the used bubble wrap from furniture stores to be the best. It's very heavy weight poly with small bubbles, is huge, and FREE. They just throw it out. You can't pop this stuff. I wrap the amp once with this and tape with reiforced tape. I go to a bike store and get bicycle boxes for FREE, then cut them to surround the amp complelety, then tape with more reinforced tape. (Uline.com for the tape) I wrap with more of that heavy bubble wrap and search for an appropriate box. I line and reinforce the box with as much of the bike boxes cardboard to take up the space. Shipping guidelines are 2-1/2 inches, so if you are shipping something valueable and heavy, and want an insurance claim paid, you need to follow that. I reinforce every corner with cut down bike box corners. If you can find an outer box with grab holes, that's a plus. Use lots of reinforced tape, and I mean lots. Think how you would want the amp shipped to you, and plan for it to be droppped repeatedly on every corner and upsidown. I've never had a problem with something I've shipped, but I have gotten so many amps and cabs shipped poorley that I will only buy local. Takes about an hour to box like I do, but it's worth the effort.