A waste disposal comprises (1) a bag part made of flexible material which has a closed lower end and an open upper end, (2) a bag collar made of relatively stiff material which is firmly attached to the upper end of the bag part, and (3) a lid which is adapted to be placed on the bag collar to close and seal the bag. The circumference of the bag collar is fitted with support elements for the lid so that the lid can be easily removed or can be inserted into or placed on the bag collar. Catch elements are provided below the support elements and function together with compatible elements on the lid to tightly secure the lid to the bag collar. The lid is fitted with at least one handle for carrying the bin.