Many people find it hard to let go of some particular things because they have ‘sentimental value’. The thing is, if you continue to be sentimental about things that do not bring value to your life and surroundings, you are putting your space at risk of accumulating clutter. There is simply no sense in keeping things especially if 

a) you can’t use them.

b) others can’t use them.

c) keeping them takes up so much space.

d) last and most importantly, if they aren’t producing feelings of joy, happiness, and love.