I emailed the tracks site, and this is the reply I recieved.
You may bring in whatever you like, it just must meet the following regulations:
·               Fans may enter Richmond International Raceway with:
 
o        One soft side bag / cooler, no larger than 6 X 6 X 12 inches.
§      Examples include: a soft side insulated cooler, a scanner bag, a fanny pack, a purse, a diaper bag, or a binocular bag, etc.
§         This one bag may be carried in any manner, i.e. by handle, with shoulder straps, on a belt, etc.
§         The soft side insulated cooler may contain ice.
 
o        One clear plastic bag, no larger than 18 X 18 X 4 inches.
§         To accommodate samples received and purchases made after fans have parked their cars.
Clear plastic bags may not contain ice.