For me personally this is part of my EDC. Getting a damp fire going can be made so much easier with these. These Bushcraft and Survival Bellows really can be the difference between having fire or not. Honestly think everybody should have some.
 
10cm long when not extended and 50cm long when extended
stainless steel to ensure these bellows stand the test of time. Extremely lightweight and can just be used as part of  pocket kit that goes everywhere with you. Thats where i keep mine. Other than that enjoy the peace of mind that being able to introduce more oxygen into the fire triangle brings.
Totally adjust able to select which length you need the bellows also.