12l yellow bag.
These drybags have a maximum diameter of 22cm and easily fit through Kayak-hatches. They have a clear window to let you easlily see what is inside - no more searching.
Other drybags make it hard to let out the air before rolling them up.
The medium (12l) and large one (24l) have valves to let out the air.
A very strong but also flexible nylon, which slides on everything, does not catch and does not wear out during use, because the surface is smooth makes these perfect for kayak use.