The idea completely eliminates the need for having separate caps for plastic bottles. The bottle design consists of an extension and a blob at the end. The blob perfectly fits the mouth of the bottle. The beauty of the design is that the whole arrangement can be made in a single blow moulding process. There is no need for the bottle manufacturer to make separate plastic caps. The caps are inseparable from the bottle and also made of the same material as the bottle. Hence the concept not only reduces plastic waste but also reduces the manufacturing cost for bottle manufacturer.