That's an excellent and practical question! You've hit on a common dilemma for homeowners who receive packages but worry about porch piracy. The good news is, yes, such products do exist, though they are more specialized than a standard trash can.
What you're looking for is often called a "secure package delivery box" or a "locking outdoor receptacle with a mail slot." These units are designed with a dual purpose. They typically feature a sturdy, locking compartment on top or at the front with a narrow, secure slot for letters and small parcels. The delivery person can slide your package through the slot, but it drops into a locked chamber that only you can open with a key or combination. The lower section is a separate, often also lockable, bin for trash or recycling.
The key benefit is security and convenience. It protects your deliveries from weather and theft while keeping your outdoor waste contained neatly in one piece of street furniture. When shopping, look for all-weather, rust-resistant materials like powder-coated steel. Ensure the mail slot is large enough for small boxes but designed to prevent arm access. Brands like MailMaster, Package Guard, and some security-focused home goods companies offer these hybrid solutions.
While a standard locking trash can with a DIY slot modification might seem like a cost-saving idea, it's generally not recommended. It can compromise the can's integrity, void warranties, and may not provide a truly secure or weather-sealed compartment for your mail. Investing in a purpose-built unit is the safer, more reliable choice for protecting your deliveries and streamlining your curb side setup.