I have one that is an actual Tidy Cat bucket and a slightly smaller one that once held Feta cheese that has had ~3-4 years of daily use. It sits on the bike in the office all day.
I haven't yet had to use them both at once, there is usually an old Cannondale pannier on the other side of the bike with my lock, jacket, and extra grocery room.
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--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7