Shoulder straps for Thermos water bottle covers. The blue one is for 1L bottles, and I believe the black and pink ones were for 0.8L bottles. The blue and pink straps are 2.5cm wide, and the black one is 2cm wide. The blue one shows signs of use, while the black and pink ones show no signs of use (or were used only a few times). However, I can't remember whether I used them or not, so I've marked the product condition as "used, with scratches and dirt" to match the blue one. Will be shipped via Yu-Packet Post Mini with only waterproof packaging.