I worked for a bottle shop during my time studying at university. Open 7 days a week, and often employ students so there is a lot of flexibility regarding what days and times suit you based on lecture times. If you're keen for extra hours, the larger chains can always advise other stores for if they need staff, etc.

The big kicker is working in retail, which was crap enough as is, coupled with dealing with angry drunks and the very occasional hold up.

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Air is for pussies.