You can't always pack the 100ml bottle of your favourite perfume: it's fragile, bulky and feels like a waste of precious space on a short trip for just a few spritzes each day.

To remove the cap of the perfume bottle​, you can use a vise to clamp the bottleneck. Because the metal part of the clamped bottleneck and the glass bottle body are laser welded, clamp the bottleneck, and then gently rotate the bottle body to try to twist off the welded part.