A towel is about the most massively useful thing you can have. This particular one though, does things no other towel does: It guides you through the mysteries of measurement conversions and even has built-in rulers.
I wouldn't let the Useful Towel replace the fluffy bathrobes I tend to favour, but I think I may spend the $US22 and toss it into my kitchen. It should help me fake understanding of imperial measurements. [Bailey Doesn't Bark via Swiss Miss via OhGizmo!]