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No. They charge by weight and/or size.
I went down to the post office to deliver my envolope.
The size of an A6 envelope is 148mmx105mm. They can be bought at the post office, Staples, Office Depot, Walmart, Target, Carlton Cards and the dollar store.
A 5x7 envelope can be purchased from the post office, Office Max, Office Depot, Staples, Amazon, Paper Mill Store, Grand & Toys, Dollarama, Dollar Tree and Walmart.
It is not the size of the envelope that matters, it is the weight - it is probably best to have the package weighed at the Post Office to obtain the correct postage.
You should put take the envelope to the post office before midnight, or earlier, on that Saturday to get the correct postmark. That is, If the pick up for the mailbox has already passed, your mail will be postmarked the following day of business, which is Monday.
NO, they have to be an already stamped envelope from the post office
The best way to find out how much it will cost to send documents in large envelopes is to take a sample envelope to the Post Office and have it weighed. They will provide you with a quote. Alternatively, you can weigh the envelope at home and use the Post Office online price guide to find out the cost.
You need to establish it's overall size and thickness, then it's weight also before you can ask the postage. The post office will be able to do this for you.
Try michales or you local craft store or if they don't have it check your local post office
You can send flowers in an envelope within the United States. The flower will not remain fresh but will be pressed in processing at the post office. Or you can send flowers that are already dried.
Take the entire package, envelope and all, to the US post office and they will take it from there.