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Largest size box that will fit in usps blue collection box?
Packages may be handed to your carrier or taken to the Post Office. Packages may also be dropped into a blue collection box with the following restrictions:
Stamped packages must weight 13 ounces or less
Packages with postage printed using Click-N-Ship or another PC Postage provider may weigh more than one pound, but must fit in the collection box
Just to clarify: that rule applies ONLY for packages with stamps on them. Packages with online postage (thru Paypal, Click-n-ship, etc.) may be posted in collection boxes.
There are 3 sizes of Priority boxes I've easily posted in collection boxes: single video (same as small flat rate), double video and the document box that measures 13 1/4" x 11 1/2" x 2 1/2".
As an aside, that "if it fits it ships" slogan for Priority flat rate is catchy, but not always your cheapest Priority option! I just sent a heavy (6 lb) box from Chicago to Atlanta (Zone 4) and the regular Priority rate was cheaper than the medium flat box rate!