Here is a typical package we ship out. Usually, a large sheet of bubble wrap will be used to wrap the contents. Items that don’t come with individual packaging will be covered in a clear bag if necessary.
Many doujinshi retailers will have an option to provide a box for domestic shipping at an added cost. I will recommend choosing this option, and this box will not be removed for overseas shipment. Likewise for accessories, if the seller mails it out in a box, this box will serve as a protective box during shipping.
If you wish to reinforce packaging for any other fragile materials that may get damaged during shipping, please ask me when making shipping arrangements. It is usually free of charge.