This Silicone STP Device by Packer Gear is a great starter for those looking to get into Standing and Peeing. At the price point and the ease of use you'll be able to tell whether you can master the art of peeing using this type of device.
If/when you upgrade to another model, this can be delegated to your camping or travel kit easily. Why do we think it's only for beginners? Because it's not easy to pack with. Check out the review for more details.
Looking for an STP that's also a Packer? Check this one out.