Picnics are not just about the food, they are about the people they are enjoyed with and the fun to be had. The toys and games that accompany the picnickers provide additional entertainment. This equipment needs to be carried easily by folding or scrunching and taking up as little space as possible.
Hard Frisbees and balls will hurt or cause injury if they hit someone unexpectedly so safe, soft, and flexible materials make toys that are good for playing with around other people. The added bonus of being waterproof, buoyant, and easily cleaned make synthetic materials ideal for playing with at the beach or by rivers, places where picnics often take place.