Provided is a utility module including a base portion and a top portion and having a front side and a back side with a locking path extending between the front side and the back side. The top portion is configured at a back portion thereof with at least one back locking bar and at a front portion thereof with at least one front locking bar extending parallel to said back locking bar. The base of the utility module is configured at a back portion thereof with a back bar coupling recess facing towards the back side and having a back under-bar arresting surface and a front bar locking arrangement comprising a front facing barrier wall and a locking lever comprising an arresting tongue extendable in front of said barrier wall and having a front under-bar arresting surface.

A fastener for detachably securing a first item to a second item comprises a connector comprising a U-shaped rod having a central portion between two legs and a main body configured to be attached to the second item. The main body comprises a housing having a slot configured to allow passage of a central portion therethrough into the housing, and a downwardly biased securing pin provided within the housing. The slot has an upstanding lip provided at a lower edge of the slot that defines two downwardly extending openings. Each of the openings are configured to allow the two legs to extend out of the housing when the central portion is in a secured position where the central portion is lowered in the housing relative to the slot. The securing pin is configured to exert a downward bias against the central portion in the secured position.

A fastener for detachably securing a first item to a second item comprises a connector comprising a U-shaped rod having a central portion between two legs and a main body configured to be attached to the second item. The main body comprises a housing having a slot configured to allow passage of a central portion therethrough into the housing, and a downwardly biased securing pin provided within the housing. The slot has an upstanding lip provided at a lower edge of the slot that defines two downwardly extending openings. Each of the openings are configured to allow the two legs to extend out of the housing when the central portion is in a secured position where the central portion is lowered in the housing relative to the slot. The securing pin is configured to exert a downward bias against the central portion in the secured position.

A case that is convertible into a stool and a working surface is provided. The case includes a worktable, a front panel removably secured to a front side of the worktable, and a rear panel removably secured to a rear side of the worktable. The front and rear panels each include a slot inwardly extending from a first edge thereof. The front and rear panels may be removed from the worktable and interconnected by sliding the slot of the front panel through the slot of the rear panel. The stool seat is removably attachable to the case and/or to the interconnected panels to form a stool.

A fastener for detachably securing a first item to a second item comprises a connector comprising a U-shaped rod having a central portion between two legs and a main body configured to be attached to the second item. The main body comprises a housing having a slot configured to allow passage of a central portion therethrough into the housing, and a downwardly biased securing pin provided within the housing. The slot has an upstanding lip provided at a lower edge of the slot that defines two downwardly extending openings. Each of the openings are configured to allow the two legs to extend out of the housing when the central portion is in a secured position where the central portion is lowered in the housing relative to the slot. The securing pin is configured to exert a downward bias against the central portion in the secured position.

A case that is convertible into a stool and a working surface is provided. The case includes a worktable, a front panel removably secured to a front side of the worktable, and a rear panel removably secured to a rear side of the worktable. The front and rear panels each include a slot inwardly extending from a first edge thereof. The front and rear panels may be removed from the worktable and interconnected by sliding the slot of the front panel through the slot of the rear panel. The stool seat is removably attachable to the case and/or to the interconnected panels to form a stool.