It is often unclear whether it is cheaper to use a flat rate box or your own box when shipping items. Flat rate boxes are convenient because they come in pre-set sizes and have predetermined shipping costs, regardless of the weight or destination of the package. This can be appealing for those who frequently ship packages as you know exactly what to expect cost wise each time you send something out. However, if the size of the item being shipped doesn't fit well into a flat rate box then using your own box may be more economical. Your own boxes can also be used in combination with other packaging materials such as bubble wrap and packing peanuts which may provide additional protection during transit while keeping overall costs down by ensuring that only necessary space is taken up within the package itself. Ultimately, it comes down to personal preference but weighing both options carefully before making a decision could save you money in the long run!