Tup's Indispensable - Soft Hackle. The Tup's Indispensable is a fly imitation that no flybox should be without. A fantastic pattern when lighter midge or mayflies are on the water. The Tup's Indispensable can be used on any water conditions whether they are rough river waters or smoother pond waters, the tup's indispensable can simply handle it all without question.