Dr. Seuss Cat In the Hat Blue Words Checkbook Cover by Tickled Pink Boutique. $5.00. The sturdy clear VINYL COVER encases a fabric bonded design. Measuring 6 1/4" x 3 1/4", the cover fits all standard bank checkbooks and banking registers. All checkbook covers come with a register flap and a duplicate check flap just like the bank, only flashier. These checkbook covers are a great alternative to the expensive covers offered by banks and online check companies.