The one problem is that you might find it difficult to compete with under saddle 'speed bags'. I have several, and I don't think I've ever paid $7.99 for one because they go on sale. It's hard to compete with Chinese labor costs.kylerodland said:yeah, the tube helps quite a bit with keeping everything in place, and the simple physics of a cinch strap. it works really well. i've been using it for about two months, did a few races with it, one was a 100 miler and everything stayed in place. it didn't slip on the seatpost at all durring any of my rides or races.