Abstract: An air valve for a poly bag that permits the escape of air from the bag as it is filled by a filling tube. The air valve consists of a plurality of slitted openings in one top corner of the bag and a valve flap mounted in the poly bag near the slitted openings that closes and seals the openings as filling material engages and moves the flap.

Abstract: A self-emptying bag having a quick coupling buckle assembly, in particular for shoulder-strap, has a buckle assembly (4) comprised of two parts (40, 41) that are respectively fixed to two sections (201, 202) of a shoulder-strap (200) of a bag so that a snatch on the bag, through the flexible transmission (30), operates the release mechanism and causes the expandable sack to be inflated to upset outside the contents in the bag. Flexible transmission (30) is connected to a coupling member (91) movable inside the first part (40) of the buckle assembly (4). The two parts of buckle are formed in such a way that first the second part (41) can be detached from the first part (40), and then the second part (41) can be detached from the coupling member (91) after a traction has been exerted on the coupling member (91).

Abstract: A reclosable plastic bag (10) having two panels (15) of plastics sheet or film joined to, or integral with, each other, or a combination of both, to define a bag with an opening (13), with separable fastening means (14) of one or more interengagable elongate fib/groove configurations (14a, 14b) are provided to close the opening (13). A slider (100) is positioned in straddling relationship to the fastening means, and includes a support member (111) over-lying the opening to the bag and straddling the fastening means, and also carrying a separating finger (112) to engage with and separate the fastening means when the slider is moved to a first end of the fastening means in a bag opened condition, and a pair of legs (113) extending from said support member to force the fastening means into interengaging relationship when the slider is moved to a second end of said fastening means in a bag closed condition. Flanges (119) on the legs extend beneath the fastening means to retain the slider on the bag.