You won't be looking directly into the sun, since the box will be pointed at the eclipse while you look away and into the box or plate, but you'll be able to see the shadow without harming your eyes.
"An opportunity like this only comes along once in a blue moon", said Tony Stapleton, 7-Eleven senior product director.
It will start at 9:05 a.m. PDT at the first point of contact at Lincoln Beach, Oregon.
The path of totality is the line across the USA where the eclipse will be at 100 percent obscuration at some point during the eclipse. Parties and parades along the "totality" route are planned, and hotel rooms are completely booked.
If your lens is small enough, according to Smith, you can hold a pair of eclipse glasses over it. The metallic dome top is ideal for taking reflective photos to be shared on social media, using the hashtags #7eleven and #solarselfie.
The sun won't be any brighter Monday than it is any other day. Also, wearing solar eclipse glasses to look through a camera, binoculars or a telescope will not protect your eyes.
If you plan on viewing the eclipse on your own, there are a few tips to consider.
Experts caution that, in addition to adults, children should be supervised children to make sure they are wearing proper eclipse viewing glasses properly.
The party in the Beer Garden will feature special themed music - yes, you'll hear "Total Eclipse of the Heart" - and tasty Dark Horse beers.
Whether or not you were watching an eclipse you should never, ever look at the sun with the naked eye, warned Mr Govender. But any individual location will only experience a total eclipse once every 400 years, which is what makes this coming Monday such a special occasion.
A total solar eclipse is an astronomical phenomenon that occurs when the moon passes between Earth and the sun, and appears to cover the latter.