Laundry is always that one thing you don't want to have to deal with while travelling, but having a travel clothes line will certainly eliminate the problem of where to hang your washing.
For youngsters travelling abroad as well as many of us who travel locally in our RV's, there are always a few issues with travelling that could be easier. Washing our clothes is one of those and just having that single device that is small enough to pack in a shoe and could be used to hang the washing up on would make half the problem disappear.
Most of the travel wash lines that are available online now are very compact and generally don't even require that you travel with pegs as they clothes can be placed between the natural braiding of the rope. In addition to this, they are extremely durable and can be stretched to a substantial length allowing you to hand multiple garment of various weights all at the same time.
They are particularly useful for hanging in showers or over baths in order to dry clothes that may have got damp or wet due to inclement weather which means that you don't have to pack wet clothes into your suitcase.
Attaching these ropes and devices to walls can be done in two different ways. Some of the devices come with wall suckers which can be used to secure to flat wall surfaces, but generally they have two loops at the end which can be used to hook them up. Hooks are often not included and it may be worth considering getting a set of removable utility hooks which are so useful for all sorts of travel needs.