Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.

In the Name of Allah, Most Gracious, Most Merciful.

All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.

According to eminent scholars such as Imam Shah Waliullah and others, if a person who is following a madhhab find it hard to follow the ruling of his madhab on a specific issue, he may choose the views of another madhhab. They base it on the fact that Islam is easy to follow and practice, and therefore, one should be allowed to follow the rulings of other schools that are easier.

An example is the ruling of Abu Hanifah and others who say that merely coming in contact with a member of the opposite sex would not render wudu nullified. So, a follower of Shafi school is allowed to follow this ruling while performing Hajj or Umrah, for instance, as it would be virtually impossible for him or her to perform tawaf, without accidentally coming in contact with members of the opposite sex.

Likewise, in cosmopolitan cities, the ruling of paying Zakatul Fitr in grain cannot be practical; so, once again, the verdict of Abu Hanifa that it can be paid in cash as long as it is what is most beneficial for the poor in a particular culture or milieu.

As for the leather made of pigs you should avoid it if you can.

Having said this, let me also state that some scholars do not consider such products (made out of the pigs) as haram.

Allah Almighty knows best.