The invention relates to a reusable flexible
package (1), intended for postal transport, comprising: an outer envelope (2), with a closure and intended to present a
postal address (3), and a device intended to be inserted into the outer envelope and allowing the securing and shock protection of at least one object (4), in which the reusable device is
inflatable and deflatable and comprises a foldable plastic pouch (5) having a sealed
air volume divided into interconnected compartments (6A, 6B), intended to be filled with air and inflated, so as to create an entrance (7A) and an inner compartment (7B) located between these air-filled compartments (6A, 6B), the inner compartment (7B) allowing to receive an object (4) which will be surrounded, secured and protected by these air-filled compartments (6A, 6B),The
plastic bag (5) has a bidirectional valve (13) that allows air to enter or exit along an axis via a tube (14), in order to inflate or
deflate the interconnected compartments (6A, 6B). (See Figure 1 for an abbreviation.)