Home Depot sells a great 25Qt Sterilite tub that is great for little guys up to about 300 grams. It measures 19 3/4" x 15 3/8" x 7 3/4". I like these over almost any other tub. They do have a locking top and are secure enough to hold a 300 gram BP, I think the model number is 1936.

Good Luck!
Jim Smith