Tie them at the corners, not the middle
The trick is to tie the floats together at all four corners, not just once in the middle. That keeps them from pivoting away from each other the second you both lean in.
Use two straps or ropes per side. Run one near the front and one near the back, wrapping around the base of each float where it’s thickest — usually right where the valve is or near the molded handles. A simple webbing strap with a buckle works best because it won’t stretch or slip like regular rope. If all you have is rope, use a trucker’s hitch or at least a couple of half hitches on each end. The goal is to keep the two floats pressed tight against each other the whole way down.
Also think about which side faces out. If your floats have raised headrests or pillow sections, put those on the outside and the flat edges facing each other. That gives you a wider, flatter center area to sit or lounge in — way more stable than having a bump running down the middle. And if the floats
