SunGrow Collapsible Aquarium Bucket - Use for Quarantining Sick Fish - Sick Bay Bucket - Great Bucket for Partial Water Changes - Collapsible, and Stores Flat to Save Space and Easy Storage
I used this as a water bucket for my dog while traveling. It worked out great, leaving partially collapsed for water during stops and fully extended to fill fully once the destination was reached. It has held up amazingly.