These attach securely inside and make sure your phone, pencils, papers, tickets, checkbook, sunglasses and other items don’t get crunched, damaged or lost among the larger stuff you are carrying. Well detailed with a mesh compartment, an elastic compartment, stiff sleeves, and one zippered compartment. Letter (8"×7.75"), Dispatch (12"×9.5"), Courier (18"×10"), or Parcel (18"×11.5").