Rolls of braided rope can be purchased at stores that specialize in outdoor goods. Braided rope is commonly used for anchor lines. Coordinate with the people you’re going with to see if they can also purchase rope as well.
Work with a friend so they can help hold the tubes in place or grab the rope for you. If your tubes have handles, tie the ropes to them to use less material.
Tie a double knot for added security.
Make a cluster of tubes rather than a straight line. The current can differ in different parts of the river and could pull one of the tubes faster. It also makes it easier to talk and relax with your friends! If you have a larger group, split up into smaller groups of no more than 5 people. This helps make it easier if you have to navigate through shallow water or rapids.
Have at least 2 straps for each tube you’re connecting. Find plastic buckles with webbing at hardware stores or stores that specialize in outdoor goods. Polypropylene is durable and water-resistant, so it will be easy to handle.
If your river tubes have handles, wrap the straps around them.
Loose straps could be hazardous if you get tangled in them, so make sure you are connected tightly.