I still take along my sketch kit. It holds my watercolour box along with my Altoids box which now holds my gouache paints. It also holds two sketch books, coloured canson paper, brushes and an assortment of pencils and pens. Most of the sketching that I do nowadays is in the comfort of the hotel room and mostly from memory.
It is hard to use colour in the hotel rooms. The lights are dim and the bulbs tend to shift the colours drastically to green. I mostly use pen and water which I don't have to worry about. Here are a couple from this week. I used a simple BIC Intensity Pen. I like it because it spreads the ink unevenly (bad for writing, but great for sketching).