I purchased a dyneema stuff sack to store my clothes while backpacking. I always felt like waterproofness for my clothes was unnecessary. as I line my pack with a trash compacter bag, but one night, my clothes (which were stored in a water resistant stuff sack) got wet in my tent from heavy condensation. After that, I decided to order a sack from Hilltop packs. I used it this past week on a backpacking trip, when I encountered a heavy thunderstorm. There was a small puddle in my tent where water had leaked through, but I didn't have to worry about my clothes getting wet at all over night! I'm thinking about purchasing more stuff sacks to give as gifts or to store other items I don't want getting wet. Affordable. Lightweight. Extremely water resistant. What more can you ask for?!