For the third edition of "Bring Your Mug Day," 340 cafes in 169 cities across France are offering free takeaway coffee or another hot drink to customers who bring their own reusable container. This event, organized by the Vrac et Réemploi network, encourages people to reduce waste by using their own mugs instead of disposable cups. An interactive map on the event's website lets users find participating stores by entering their postal code. Last year, over 10,000 drinks were given out in this way, highlighting the growing interest in sustainable consumer habits. The initiative is supported by the AGEC law (anti-waste for a circular economy), which requires stores to offer discounts on takeaway drinks to customers who bring their own mug. On average, the discount is about 30 cents per drink, similar to the discount offered in SNCF train buffet cars. To qualify for this discount, the container must be clean and suitable for hot liquids. This benefit is available year-round, encouraging consumers to adopt more sustainable habits beyond a single event. In addition to reusable mugs, consumer habits are shifting toward bulk buying, which allows customers to purchase products without individual packaging. A recent experiment at a Leclerc hypermarket in Templeuve (Hauts-de-France) showed that offering bulk coffee at a 5% lower price than the packaged version led to bulk sales surpassing those of the pre-packaged product—an unprecedented result. This shift may be partly due to rising plastic prices, which have made bulk options more attractive. However, the cost savings from bulk buying depend on the product category. For highly competitive items like rice or pasta, pre-packaged versions often remain more cost-effective. In contrast, bulk sales are more advantageous for items like spices or pistachios, which are typically sold in smaller quantities and face less competition. To accurately compare prices, consumers are advised to check the cost per kilogram or per liter, which provides the most reliable measure of actual savings.