One of the toughest packing challenges is keeping your dress shirts or blouses looking decent after you have stuffed them into a suitcase for 8 to 24 hours. I've tried all kinds of bags and devices (and switched to mostly wrinkle-free shirts), but this Eagle Creek Pack-it-Folder delivers better than most.
It doesn't look all that different from many other similar items, but it comes with a secret weapon: a "packing board" inside that you fold your shirt over to make it fit perfectly. Then you slide the thin plastic piece out and do the same with the next shirt. This enables the shirts or blouses to fit into a smaller space than they would if you did it haphazardly. Also, it has a double-fold, double-velcro clasp system that keeps everything held down tightly. I'm not sure I'd stuff in the 8 to 12 items Eagle Creek says it will hold, but I've done fine with 6 dress shirts.
As with any flat shirt packing pocket, your collars will get crushed regardless, so you might want to wear that $200 Brooks Brothers French cuffs shirt with a starched collar onto the plane. Otherwise, stuff away.
The Pack-it-Folders come in three sizes and enough colors to match nearly any luggage ensemble, with a list price from $22 to $28. Order online at the following:
Eagle Creek Pack-It Folder from Backcountry.com
Pack-it-folders at Magellan's