Q: What is the weight of this bag
A: The bag weighs approximately 870g.
Q: Will a 65 litre backpacker rucksack fit inside this?
A: It would depend on the exact shape of the rucksack. I would guess most would fit inside but with not much room to spare.
Q: Is there any way for this bag to be locked?
A: You could feasibly gather the top so the holes are together and put some form of padlock through it. But there would still be openings a the top so it wouldn't be all that secure.
Q: What's the capacity of this bag in litres (approx.)?
A: It is approximately 100 litres.
Q: What size is this bag?
A: When laid flat, the bag measures approximately 17 inches across and 36 inches high.