The students have sandwiches in their backpacks. They took a sleeping bag and a backpack with a few clothes and some food. Whose backpack is this? You cannot enter here with a backpack. You should take a backpack on trip.
We will also have to take our rucksacks, hiking boots, warm pullovers and waterproofs to protect ourselves from rain and wind. What have you got in your rucksack? It's very heavy. What is more, I had a very heavy rucksack and that was another obstacle which prevented me from doing anything. put my lunch box into my rucksack the police do have the rucksack you had in Gosseborga