The Loaf of Bread Comparison...

The SMALL Toy Tamer Bag is 5.5" x 3" x 10" and will fit one standard size loaf of bread

The MEDIUM Toy Tamer Bag is 8" x 4" x 10" and will fit that same stand sized loaf of bread with almost an extra 3" to spare on the side and an extra 1" of depth

The LARGE Toy Tamer Bag is 10" x 6" 12" and will fit those same standard sized loaves of bread stacked on top of each other (a little tight).  This bag is great for large volume, but light weight toys.  If the toys are really heavy (i.e. metal Hot Wheels cars) then my suggestion is to split those between 2 smaller Toy Tamer Bags so they are easier for the kids to carry.