Most listings list polyester and polyurethane as the primary materials.

The listings use zipper closures.

Most listings state “3 years and up,” but one listing shows “14 and up.” Because recommendations vary, check the individual product listing for the exact age guidance.

Listed capacities include 16 ounces and 18 ounces.

Yes — listings describe insulated interiors or thermal linings intended to help keep hot or cold foods fresh.

They commonly include a top carrying or easy-carry handle and are described as lightweight and easy to carry.

Dimensions vary by model. Examples include: 4 in H × 9.5 in W × 9.5 in D; 4 in H × 8 in W × 10 in D; 9.0 in H × 3.5 in W × 7.5 in D; and 10.2 in W × 8 in H × 3.5 in D.