Backpack Lunch Cooler

backpack
A backpack (also called rucksack, knapsack, packsack, pack, or Bergen) is, in its simplest form, a cloth sack carried on one's back and secured with two straps that go over the shoulders, but there can be exceptions. Light weight types of backpacks are sometimes worn on only one shoulder strap.
Travel or hike carrying one's belongings in a backpack
a bag carried by a strap on your back or shoulder
hike with a backpack; "Every summer they are backpacking in the Rockies"

cooler
An insulated container for keeping food and drink cool
an iced drink especially white wine and fruit juice
A device or container for keeping things cool, in particular
A refrigerated room
a refrigerator for cooling liquids
a cell for violent prisoners

lunch
take the midday meal; "At what time are you lunching?"
a midday meal
Luncheon, commonly abbreviated to lunch, is a mid-day meal.
A meal eaten in the middle of the day, typically one that is lighter or less formal than an evening meal