neru design works neru no bag neru design works NERU NO BAG I am selling this as I have no use for it. A cool bag made of Tyvek with a strong presence. The lining is sewn with a heat-insulating sheet. It is large enough to hold a 500ml PET bottle, but it can also hold a mess tin or sierra cup. Also, it is the perfect size to hold a KOVEA CUBE, so it can also be used as a storage bag. As you know, Tyvek is a very strong material, and the texture increases the more you use it, so it is a bag that is fun to use. This is a simple cool bag, so it does not have a refrigeration function. Also, because the cooling material and Tyvek are sewn together, the shape and size accuracy will vary for each one.