That's a great and very practical question! The short answer is: it completely depends on the specific trash bin you purchase. Most of the time, outdoor trash bins do not come with liners included in the box. They are typically sold separately. Think of it like buying a filing cabinet—it usually doesn't come with the folders.
When you buy a standard outdoor trash can from a home improvement store or online retailer, you are primarily paying for the durable, weather-resistant container itself. The liners are considered a consumable accessory, much like bags for a vacuum cleaner.
However, there are a few exceptions. Some higher-end or specialty bins, especially those sold as part of a "system" or a bundled set, might include an initial roll of liners to get you started. It's always a good idea to double-check the product description or the "What's in the Box" section before you buy. Look for phrases like "includes one roll of liners" or "liner not included."
So, you will almost certainly need to buy liners separately. The key is to get the right size! Check your bin's dimensions and look for bags labeled for its gallon capacity. Using properly sized liners ensures a secure fit, prevents tearing, and makes taking out the trash much easier. You can find them in rolls at any supermarket, hardware store, or online.