Across the petal industry, measuring in cups and litres is standard practice and you'll find that all suppliers do this. Petal weights vary greatly depending on the type of flower, the size of the petals and even the humidity so volume is considered a more reliable measurement. We use standard kitchen measuring cups and a litre jug to measure the petals. We fill these to the top with petals when measuring and always ensure the right amount is included in each bag. In fact, when we can we often include an extra cup for good measure! We recommend 2/3 of a cup to 1 cup of petals per person taking part in a petal toss. This is approximately a handful and will comfortably fill a 4x6 inch organza bag or standard petal cone. 2 litres of petals is our smallest size and could be used as personal confetti for the bridal party or a small group of guests. The average confetti purchase is 6-8 litres for 30-40 guests.For proposals a 4 litre box (20 cups) is the most popular size, although 2 litres would give you 10 cups to decorate a table, bath or to add a few handfuls onto the floor or a bed.