In a pot, boil vinegar, water, sugar, and salt until dissolved. Then turn off the heat and set to the side.
Meanwhile, wash and dry cucumbers. Cut into desired shapes: spears or chips. Make sure if they are cut into spears, that they are short enough to fit into the jars you are using to pickle.
Add 2 garlic cloves, 1/4 tsp red chili, flakes, 1/4 tsp black peppercorn, 1 tsp mustard seeds, and pinch of dill to each jar. Top with cucumber leaving 1/4" headspace. Make sure to pack the cucumbers in real tight.
Pour brine into each jar leaving 1/4" headspace. Using a butter knife or chopstick, go around the inside of your jar sticking all the way to the bottom (this will release any air bubbles to the top). You may be able to add some more brine after doing this but make sure to leave 1/4" headspace.
Place lids on jars and twist until finger tight. If you plan on eating the pickles soon, they are ready to go into the fridge. If you want to store the pickles in your pantry, let's move on to water bath canning.
Please refer to the Ball website for official canning instructions. I used a large stock pot as a water bath canner for 10 minutes.