Yes, you really do.
Water can seep through the roll-top closure of a dry sack/bag (regardless of brand), so double-bagging is a common sense measure to prevent your phone from getting wet or damaged. Relying on a single dry sack/bag, no matter how new it is or how well it has been taken care of, is not something we would recommend.
You can read more about Packing Electronics on our blog.
Articles in this section
- Which dry bags/sacks are appropriate for external use? (i.e. not inside another bag or pack)
- I have a hole in my stuff/compression sack, is this covered under warranty?
- Do I really need to "double bag" my phone when using a dry sack/bag?
- What size compression sack do I need for my sleeping bag?
- What does IPX8 mean?
- Is the external pocket of the rapid / flow dry pack waterproof?
- Hydrostatic head - what does it mean?
- I want to place my phone/camera/laptop in a dry bag, which one is the best to use?