【Letter Pack Light Envelope】 A shipping method where you can put items (up to 3cm thick, 4kg or less) inside and send them by dropping them in a post box, handing them over at a post office counter, or having them picked up. Advantages: Convenient when you want to send items heavier than 2kg or send written correspondence, or when you want to ship without leaving your home. It's delivered to the recipient's mailbox, reducing the risk of being returned due to absence.