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High-density items are solid objects (such as tools, hardware, and machine and auto parts) whose weights are comparatively high for their volumes.Package high-density items weighing more than 15 pounds so that the contents do not exert more than 60 pounds per square foot on the smallest side of the mailing container.Twine or cord should not be used for closure and reinforcement, as it could interfere in mail processing equipment.
There are five mail processing categories for mailpieces: letter, flat, machinable parcel, irregular parcel, and nonmachinable parcel.
USPS assigns each mailpiece to one of these categories based on the physical dimensions and characteristics of the mailpiece using the longest dimension as the length, regardless of the placement or orientation of the delivery address on the piece.
If an odd-shaped item is not properly wrapped, it could burst through the envelope and cause injury to employees and damage to USPS processing equipment.
Odd-shaped items that are properly wrapped within paper envelopes and sent at letter prices may be subject to the nonmachinable surcharge under Aerosols (containers under pressure) are hazardous materials and must be constructed to prevent accidental discharge of the contents during postal handling.
When multiple items are inside a single mailing container, mailers must cushion items to protect them from each other as well as from external forces.
Do not package high-density heavy items with fragile items unless extreme care is taken to separate them from each other.Mailable aerosol containers must be packaged under Publication 52, (PUB 52) part 342.Mailpieces containing perishable, hazardous (including infectious substances), biological, or restricted materials are subject to the standards in PUB 52.Plastic bags must be at least 2 mil thick polyethylene or equivalent for easy loads up to 5 pounds; 4 mil thick for easy loads up to 10 pounds.Heat-shrinkable plastic film—either irradiated polyethylene, linear low-density polyolefin, or copolymer—may be used as packaging for mailpieces under the following conditions only: Cloth bags are acceptable for easy and average loads of up to 10 pounds, if the seams of the bags equal the strength of the basic material.The following three terms describe types of loads, based on content, degree of protection, and strength of the mailing container.Tags: Adult Dating, affair dating, sex dating