We just had to complete the set and build a 40oz vinyl top pack to pair up with our vinyl panniers. We believe this top pack will not only keep everything nice and dry inside, but also handle any sticks your pack animal can throw at it! 
Complete with 4 - 4ft long x 1" webbing straps with buckles and keepers.
Approx size 25"W x 34"L x 12"D