This is my first instructable. In 2002, my older son came back from Aprovecho Research Centre in Oregon to BC with square bucket panniers that a fellow named Miguel had invented. I experimented with the concept, and modified the design so that my heels didn't kick the panniers while pedaling. The original inner tube hook for the pannier was located in the middle of the box. This means you will be building a left pannier and a right pannier. As well, I found that larger washers prevent the plastic breaking over time. These panniers are quick to install on the bike and remove, and are great buckets for taking into grocery stores. The panniers sit at the same height as the bike rack, so you can load a wide object on the back of the bike. They are even good for dumpster diving! My younger son used them for a 3,000 km (1900 mile) bike ride in 2005. I liked these panniers enough to promote them in Prince George, BC since 2005.