Here's my slosher tray(basket) that I made for 4 x 5 negs. Perforated plastic sheet from the Craft department at Walmart and hot melt glue. The sheets (about 15" x 20") were about $5 for a package of 5. The sheets easily cut with scissors. Slosher basket is sized to fit into 11 x 14 trays. So far, it has worked great.