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First is Priority Mail Flat Rate and the other is Priority Mail Retail/Commercial

For safety reasons, lithium batteries and devices with built-in batteries are universally prohibited from being carried in checked luggage

For instance, pilot trials have shown that materials with low wet strength, such as certain flax/cotton blends, may require the integration of strengthening fibers like Tencel to prevent tearing during high-speed transfer on the production line

[Source: Alison Jackson, AFP, May 2011

With an FPR 4 rating (roughly equivalent to MERV 67), they help capture common airborne particles like lint, dust mites, pet dander, and pollen, making them a decent option for general home use