Polybags (available in hundreds of sizes) are one of the quickest and cheapest ways to package a product. Due to their flexibility, a lot of products of different sizes and shapes can fit inside of them easily.
Their shape, size, and design can be easily altered. They can be simple with just an open end, or they can have more features such as ziplocs.
Polybags do a great job preventing abrasion and keeping the product clean from dust and other forms of contamination when shippingt.
This type of packaging can also be both clear or printed. This gives you a variety of options for viewing the product inside the bag or putting graphics to communicate the message you want.