Drybags usually have a roll over closure thats 100% watertight. The lightest weight drybags are for weight conscious backpackers and will not be as robust as heavier weight versions.
Drybags usually have a roll over closure thats 100% watertight. They come in various sizes and weights - the lightest weight drybags are for weight conscious backpackers and will not be as robust as heavier weight versions. Some have valves to let the air escape as you compress the contents. Others have windows so you can see the contents.