For a tight closure in the 1980s most bags had seams that were internally taped which is still common practice at many manufacturers today. But stitched elements are always a weak point in bags and backpacks because the thread perforates and thereby damages the material. For long term and intensive use this kind of waterproofness simply wasn’t good enough. But it all changed in 1984 when ORTLIEB introduced the so-classed high-frequency welding technology. The ORTLIEB Micro Two Saddle Bags are descended from this radical change delivering reliable bags that can keep up with any adventure.