Sharp objects can compromise your compression bag, so either leave them out or wrap them in clothing. Tent poles or stakes could also poke a hole in the bag, so find another spot. Many backpacks have straps on the bottom for holding these and other items. The tent itself, as well as the rain fly, are open to debate. Some say they’ve had no problems; others warn that compressing a tent too tightly can damage it or compromise any waterproof coatings. Check your tent’s instructions or contact the manufacturer.