knapsack /napˈsak/

1. A bag made of strong material, with straps for carrying on the back, eg when hiking
2. A rucksack

• watering-troughs
• waterish
• waterishness
• waterishnesses
• water jacket
• water jackets
• water-jet
• water joint
• water joints
• water jump
• water jumps
• water key
• water keys
• water leaf
• water leaves
• water lemon
• water lemons
• water lens
• water lenses
• waterless
• water level
• water levels
• water lilies
• water lily
• waterline