As part of the protest a marine biology student wore a crisp packet dress to her graduation. She claimed the dress was inspired by litter she had seen on a beach. In September 2018, Royal Mail appealed to customers to stop posting empty crisp packets to Walkers, which campaigners had asked people to do and "flood Walkers social media with pictures of us popping them in the post". Royal Mail was obliged by law to deliver the bags to Walkers' freepost address, but without envelopes they could not go through machines and must be sorted by hand, causing delays. Walkers most common flavours of regular crisp are Ready Salted (sold in a red packet), Salt & Vinegar (green), Cheese & Onion (blue), Smoky Bacon (maroon) and Prawn Cocktail (pink). Other flavours are sold in other coloured packets, such as Beef & Onion (brown), Marmite (black) and Worcester sauce (purple). Some flavours were made available for a short time either because they tied in with special promotions, or failed to meet sales expectations. Walker's "Great British Dinner" range included Baked Ham & Mustard and Chicken Tikka. A series of "mystery flavours" were launched in 2012, and later revealed to be Sour Cream & Spring Onion, Lincolnshire Sausage & Brown Sauce and Birmingham Chicken Balti. In 2016, Walkers produced a limited edition 'Winners - Salt and Victory' crisps to commemorate their home-town football team, Leicester City, winning the Premier League for the first time. Earlier that season, Walkers had given Leicester fans in attendance at a match versus Chelsea bags of "Vardy Salted" crisps, bearing the image of the Foxes' striker. Other products sold by Walkers include their "Baked" crisp range, "Cheese Heads", "Crinkles", "Deep Ridged", "Extra Crunchy" 150g bags, launched in 2010 "Lights" (low fat crisps, formerly "Lites"), "Market Deli" crisps, pitta chips and tortilla chips, "Max", "Pops", "Potato Heads" (discontinued in 2008), "Salt 'n' Shake", "Sensations", "Squares", "Stars", "Sunbites" (wholegrain crispy snacks) and "Hoops and Crosses". Other types of snack food sold by Walkers include "Chipsticks", "Doritos", "French Fries", "Frazzles", "Mix-Ups", "Quavers", "Wotsits", "Monster Munch", "Twisted", "Wafflers" (formerly a "Wotsits" variant), "Sundog Savoury Popcorn" and "Snaps".