Anything will do, as long as it can be packed down to a suitable size to carry by one, or more people for all the bits, boat, inflator, personal buoyancy. Don't bother with conventional paddles. Either use your hands, minimalist Gollum style, or a couple of table tennis bats for more comfort. Croesor-Rhosydd doesn't have any tight sections, so size of the packages doesn't matter, only ease of carrying.