The term “stressed state” as used herein refers to a state of application of an external force on components (such as the extension element) of the device. Moreover, the stressed state indicates a condition where the extension element is under a predefined tension, such as a longitudinal pull, that causes it to extend beyond its relaxed state. It will be appreciated that when the extension element is in the stressed state, then the second section which is fabricated from elastic material and, the part of the first section which is fabricated from non-elastic material, lie parallel to the axis of the extension element as a result of stretching of the elastic material of the second section. The term “axis” as used herein refers to a straight imaginary line passing through the extension element, along a length thereof. The two ends of the extension element will move parallel to this imaginary line when the external force is applied on the extension element. It may be appreciated that the amplitude (height) of elements (namely the first section and each of the plurality of layers of the second section) of the loop structure depends on the distance between the first and second attachment points of the extension element. In an example, when the distance between the first and second attachment points of the extension element is equal to the shortest layer of the second section, the shortest layer does not form the loop in the relaxed state. In an example, when the distance between the first and second attachment points of the extension element is less than the shortest layer of the second section, the shortest layer forms the loop in the relaxed state. It may be appreciated that in a 100% stressed state (i.e., fully-extended state), the length of the second section will extend to achieve a length comparable to the length of the first section. For example, if the length of the first section is 90 cm, the length of the second section will be 90 cm in its 100%-stressed state. In such case, the first section and the second section overlap each other along the axis with no visible loop structure. Similarly, in a 50% stressed state, if the length of the first section is 90 cm, the length of the second section will be 45 cm. In such case, the loop structure of the first section and the second section are still visible. The term “fastener” as used herein refers to a hardware element (or component) of the device used to secure the loose end(s) of the strap. In this regard, the fastener is attached at an end (namely, the first end and/or the second end, the third end, and so on) of the extension element. Optionally, the at least one of the at least one ends of the extension element is implemented as an attachment loop or fastening loop configured to receive and secure the first section to the fastener(s) from a mounting end of the fastener. Optionally, the attachment loop or fastening loop is created by bending over a part of the first section (towards an end(s) of the first section) over the mounting end of the fastener, and bonding the bent over part of the first section while leaving a groove (or ring-like space) around the mounting end of the fastener.

Optionally, the attachment loop or fastening loop is created by bending over the part of the first section that is outside the at least partially middle section over the mounting end of the fastener, and bonding the bent over part of the first section while leaving a groove (or ring-like space) around the mounting end of the fastener. Optionally, the bent part of the first section is bonded adjacent to the first attachment point and the second attachment point of the extension element, respectively. Beneficially, the bent-bonded part of first and second ends of the first section provides more strength to the first section. Moreover, placing the bent-bonded part of the first end and the bent-bonded part of the second end of the first section, near to the first attachment point and the second attachment point, respectively enables in equal distribution of the tension along the extension element, when the external force is applied thereto. It may be appreciated that when the device is in the stressed state (i.e., the external force is applied on the device), the third and fourth attachment points of the second section are arranged adjacent to the bent-bonded parts of the first and second ends of the first section, respectively.

The fastener comprises an attachment end distinct from the mounting end thereof. Herein, the attachment end is arranged opposite to the mounting end of the fastener, to provide the antagonistic pairing between the loose end(s) of the strap and the fasteners. Notably, the attachment end is implemented as an open space for receiving the loose end of the strap. Moreover, the fastener typically comprises a clamping or gripping mechanism for firmly holding the received loose end(s) of the strap.

Optionally, the fastener comprises a sprung set of teeth. The term “sprung set of teeth” as used herein refers to a clamping or gripping mechanism employing pointed spikes or teeth to engage with the loose end of the strap, to provide a secure grip thereto. Optionally, the sprung set of teeth is provided towards the attachment end of the fastener. It may be appreciated that the sprung set of teeth help the fastener to hold the strap tightly by providing a required friction therebetween. Beneficially, the sprung set of teeth of the fastener help the device to handle the excess tension applied on it during the stressed state, thereby maintaining the antagonistic pairing of the device and the loose ends of the strap.

Optionally, the device comprises a pair of fasteners, wherein each fastener is arranged on the corresponding first end and second end of the extension element and is configured to receive a corresponding loose end of the strap therethrough. In other words, the device comprises a first fastener arranged at the first end of the extension element and a second fastener arranged at the second end of the extension element, configured to receive a first loose end and a second loose end of the strap, respectively. Notably, the at least one first loose end and the at least one second loose end of the strap are received in the first fastener and the second fastener via corresponding attachment ends of the first fastener and the second fastener, respectively. It may be appreciated that, in this regard, the pair of fasteners are designed to receive and firmly hold the loose ends of the strap for creating a secure connection and antagonistic paring therebetween. Beneficially, the connection between the fastener and the strap is, namely the antagonistic paring therebetween, creates a reliable and durable connection between the device and the strap, thereby, preventing them from separating unintentionally.

Optionally, the fastener is implemented as a clip. The term “clip” as used herein refers to a mechanical component designed to hold an incoming thing (such as loose end(s) of the strap) together. In this regard, the clip-type fasteners typically involve a clamping or gripping mechanism for easy attachment and removal without the need for additional tools. Moreover, the clip may be designed in various shapes, sizes and by using different fabrication materials (metal, plastic, or a combination thereof), based on the application thereof. The technical effect of implementing the fastener as a clip allows bridging the loose end(s) of the strap for creating the antagonistic pair therebetween, while enabling rapid assembling (attachment) and disassembling (detachment) thereof.

Optionally, the clip is implemented as a quick-release clip. The term “quick-release clip” as used herein refers to a type of mechanical component that is designed for easy and rapid attachment or detachment of the device and the loose ends of the strap. The quick-release clip is designed to be easily operated by hand for opening and closing it, without needing additional tools or extensive manual effort. In this regard, the quick-release clip can be opened by means of a lever, a button, a switch, a latch, a hook-loop arrangement, a catch-eyelet arrangement, or other intuitive controls. For example, many backpacks feature quick release clips on their straps, allowing users to easily open and close the buckles for quick access to the contents. Typically, the quick-release clip allows the loose end of the strap to pass therethrough in its open conformation, and tightly holding the received strap via the grasping or clamping mechanism in its closed confirmation.