Trout eat bugs. Knowing what bugs are in the water helps you catch trout. This kit is a great choice for those looking to learn more about the bugs found in their waters. It has everything you need for capturing and identifying aquatic insects while on the water. The 4x9 inch carrying case is easily carried in a vest or pack and has plenty of extra room for additional gear. The kit contains a collapsible seine, three glass vials, one petri dish, magnifying glass, water thermometer, larvae forceps, & a 59 page insect guide/fly fishing instruction book.