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Each sleeping bag comes with a waterproof stuff sack from Ortlieb. The stuff sack has a roll-top closure, which means a few things need to be kept in mind when packing.
Tips for the roll-top closure:
1) First, roll the closure tightly only in the middle, so air can still escape from the sides.
2) Kneel on the stuff sack to achieve good compression.
3) Only now roll the entire closure tightly.
If there isn't enough tension on the roll-top closure, it can happen that the closure unrolls as the sleeping bag expands. You can avoid this by folding the ends of the roll-top closure over each other before closing it:
