These look like "pull packs" used in fulfillment centers (i.e., warehouse distribution centers). Based on where you came across them, most likely Amazon. As orders for products come in to the fulfillment/distribution centers, they are pulled, picked, ticketed, then sorted by destination, much like the USPS "flat trays" used to sort...to sort...um...oh, what do they call the kind of mail that is broadly distributed? Typically addressed to Resident? Often used as sales or fundraising solicitations? Can't be larger than, like, 6 1/4" x 4 5/8"? Can have no more than three folds, etc.? Not Fourth Class mail but something else. You know, that kind of mail. ((Seems like I'm always bumping into clouds lately. Very frustrating.))
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