Shooting from a camera mounted to a tripod usually results in better images as the camera is less likely to move. A heavier tripod is generally more stable, but you don't always want to lug one around on an outdoor shoot. Instead, attach a weight-bearing hook to the centre column of your tripod and use your camera bag or backpack to provide the weight.
Instructables user Andrew Axley came up with the design. Simply drill a hole through the centre column of your tripod, use a bolt and nut to fit the hole you've drilled, bend the top of an S-hook to fit inside the centre column, and hang the S-hook from the the bolt. Of course, complete directions and step-by-step photos can be found at the source link below.
This mod gives you a sturdy hook that you can attach any convenient object to stabilise your tripod. It's definitely a nice upgrade for a cheap tripod.
Tripod Stabilizer Weight Hook [Instructables]