We at Sanborn Canoe strongly recommend using Cam straps to secure your canoe. Reliable and simple to use, these 1" wide, 15-foot long straps hold your canoe securely in place, without risking damage from over-tightening with a ratcheting strap. Secure your canoe to a roof rack or to the top of your car using our foam blocks.
Sold as a pair.
Very good product, I am using it in short trips to the local lakes around Los Angeles and it work pretty nice.