Using the USPS module, I have every domestic shipping option checked and most will show up when you go to checkout, but based on the dimensions and weight of the product being tested for shipping the First Class Large Envelope option should show as a shipping option. The product dimensions are length = 11, height = .25, width = .25 with First Class Large Envelope set to length = 15, width = 12, thickness = .75, so the dimensions should work with First Class Large Envelope. The weight of the product is set to .25 for 4 ounces and the module weight for First Class Large Envelope is set to 13 ounces. So both dimensions and weight fit the criteria for First Class Large Envelope, but this option is still not showing when one goes to checkout. I having been searching around forums and have been unable to find any probable solution or explanation as to why the problem is occurring. Any help would be appreciated, as this is the last item I need to complete to get my shop operational. Thanks in advance.