I purchased this set in large part due to the casing because it allows all of the repetitive parts to be altered at a later time, so transforming it into something more professional. But there isn't a single instance of this everywhere, even though it would be nice to have everything in one location. Various advantages: Any bits that are readily available in addition to a variety of other beneficial items (there was a time when a flexible adaptor for bits was quite useful). I had the majority of the instrument and bits, as well as feathers, wood crowns, and heads; but, all of this is separate and in bulk, and each time you need to do something, you need to remember where it is, carry a box with you to the mountain where it is poured, and dig into it. I had the majority of the instrument and bits, as well as feathers. I followed my instincts and grabbed the suitcase, and now everything is in order. Con disadvantages: certain dies with bits do not fit tightly and fall out, while others, on the other hand, fit very tightly and do not fall out.