When buying a packer, there are a few things to consider to ensure you get the best product for your needs:

1. Size: Packer size can vary significantly, so consider what size would feel most comfortable and natural for you. Some packers are also available in different colors or skin tones to match your complexion.
2. Material: Packets can be made of various materials, including silicone, cyberskin, or even foam. Each material has its own texture and weight, so choose one that feels most natural and comfortable to you.
3. Shape: Some packers are shaped to create a realistic bulge or to resemble an erect penis. Think about what shape and size would be most comfortable and natural for you.
4. Attachment method: Some packers can be worn without a harness, while others require a specialized harness or underwear to keep them in place. Consider which attachment method would feel most comfortable and secure for you.
5. Price: Packets can range in price from under $10 to over $100, so consider your budget when making your selection.

When buying a packer, it's a good idea to read reviews and compare different products to find the one that best meets your needs. You can find packers online or in some adult stores. Additionally, if you have any questions or concerns, consider reaching out to a medical professional or a therapist who specializes in gender identity issues for guidance.