Our customer was the first to develop a custom stainless flip top growler. They came to us back in 2011 with the idea and asked us to find the proper manufacturer to make this dream into a reality. His idea was to sell it to micro-brewing companies and breweries in the U.S. and Canada. He didn't think that the 2L growlers made out of glass with a twist cap was unique enough. We sourced and worked with the best stainless steel bottle factories that could provide a flip top lid like Grolsch beer had, which had a swing top lid. It took us a month to perfect the design that was approved and then we moved onto the mold so we could start to test the product. After 2-3 months, we finally had the product completed and approved. It sold so quickly that our customer decided to order a full container of 10K+ right away. This program was so hot that our customer came up with the idea to upgrade to double wall growlers to compete with Hydro Flask. We ended up making 4 sku's of both 1L and 2L single and double wall growlers, while the program last more than 10+ years.They came to us to find the proper manufacturer to make this to a reality...and we did.