Why get a triangle shaped hamper? Although there may be an aesthetic appeal to the triangular shape, the idea is that these kinds of baskets will fit neatly in a corner. This is practical in that it makes full use of the space available, and it is attractive in that the face of the hamper is properly displayed. With a regular hamper, this could only be achieved if it was placed in the corner at an angle.
I like the bamboo look of these two:
Triangle laundry hampers pictured:
Left: Honey-Can-Do HMP-01618 Wicker Corner Hamper, Clothes Organizer
Right: Collapsible Bamboo Laundry Hamper W/cotton Liner. Triangle Shape. by Ginson