Seventy pounds is the top weight for any mailed item before you get into “overweight” mailing costs.

The postal service’s weight limit is almost definitely backfilled here from a piece of commonly-used mail-sorting equipment. Let’s calculate things for the hell of it together.Īttorney Paul Sherman was quick to add a caveat to his first tweet, joking afterward that it was to prevent a “well, actually” moment from astrophysicist and noted Twitter pedant Neil deGrasse Tyson. And it’s also fun to think about, for example, a box full of steel ball bearings, or a box somehow filled to the brim with dense liquid mercury. If true, it’s pretty funny that this small flat-rate shipping box has a weight limit that is physically impossible on Earth we can muse that it says something about the severity of the U.S. If you could cram anything you wanted into a small flat-rate box from the United States Postal Service (USPS), is it possible to exceed the 70-pound domestic weight limit? A Washington, D.C.-based policy attorney said in a viral tweet last week that it was “physically impossible,” so we decided to put his theory to the test. We could get denser if we looked to space, with “neutronium” in neutron stars.

Osmium, the densest naturally occurring element, is used to make tiny, precise, durable parts.

A viral tweet claims that you can’t max out the 70-pound weight limit on a small pre-paid mailing box from the United States Postal Service (USPS).

This will allow your carrier to leave your order if you are not available.Įxpedited packaging supplies can be shipped via Priority Mail® service within 1-3 business days for a fee. For your convenience, all orders will include a “Carrier – Leave if No Response” endorsement.

territories.Įxpedited packaging supplies are shipped via USPS Ground Advantage™ service within 2-5 business days at no cost to the customer. The Postal Store® cannot accept orders for shipment outside the United States, but we do ship to APO/FPO/DPO addresses and U.S. If your order contains multiple items, they may be shipped separately. Orders from the Postal Store® website may be shipped from different distribution centers. To view your order status and tracking information, sign in to your ® account, go to 'Activity History', and select your order number. Please allow one business day from order receipt for in-stock items to be shipped via USPS Ground Advantage™ service or via Priority Mail® service for a fee. Through the Postal Store® website, the Postal Service ships all in-stock orders with USPS Tracking® service.

Usps flat rate small box weight limit