Car-Toon via Amazon has 2.5-Galon Olitec Leakproof Collapsible Car Trash Can w/ Lid & Storage Pockets on sale for $3.99. Shipping is free w/ Prime or on orders $35+.

Features:

• Multifunctional trash can for car can also serve as a storage and organizer.
• Built-in waterproof and leakproof interior lining effectively protects the trash can and your car from getting wet by drinks and grease stains.
• The bag has an adjustable strap to allow you to hang and hold the bag in place. When not in use, simply flatten the bag and easily store in tight spaces.