Abstract: A plastic bag includes a bag body having an top opening, a bottom edge, and a trash chamber defining therebetween, and a bottom enhancement arrangement including a sealing edge formed along the bottom edge of the bag body in such a manner that when the bag body is folded into an usage condition, the sealing edge is inwardly flipped into the trash chamber while two bottom side portions of the bag body is downwardly folded to form a round bottom portion of the trash chamber for evenly distributing a weight of the trashes so as to protect the sealing edge from being broken by means of the weight of the trashes.

Abstract: A zipper bag includes a bag body having two opening edges, and a zipper arrangement including two zipping fasteners integrally attached along the opening edges of the bag body respectively to form a pair of sliding engagement rails, two stopper ends provided at two ends of the zipper arrangement, and a zip locker, having a guider arm, which is slidably mounted on the sliding rail and arranged in such a manner that when the zip locker is slid to one of the stopper ends of the sliding rail, the guider arm is slidably guided to unfasten the two zipping fasteners with each other, and when the zip locker is slid to the other stopper end of the sliding rail, the two zipping fasteners are guided to fasten with each other so as to enclose a storage cavity of the bag body in an airtight manner.