What's the common filling of punching bags?

Punching bags are traditionally filled with sand, water or grains; however you can use around the house items if you prefer. Some materials that can be a good substitute are rolled up garbage bags (packed tightly), ripped clothes/sheets/rags, cotton, rice, or a combination of these items. What you fill your bag with depends on how heavy and hard you want your punching bag to be.

Filling your punching bag doesn't have to be a daunting task. I found you a great 5 step how to guide that will explain how to fill your bag.

http://www.livestrong.com/article/187354-how-to-fill-a-punching-bag/

Punching bags can be filled with a variety of resources including sand, water, finely ground wood and grain. The filler is often determined by the size and use of the bag.

There are versions of freestanding punching bags; which usually come with a heavy frame. The majority of these frames can hold a punching bag with a weight of up to 100lbs.

Punching bags are most commonly used for physical exercise, conditioning and stress relief.

Punching bag weighing 70-90lb are the most commonly punchingbag for an adult weighing 140-170lb.if you weigh more than 170lb you may wantto shop for 100 or more punching bags. The weight of the bag will increaseaccording to your own weight and punching power.

The most commonly used exterior types are vinyl, nylon,canvas, and leather. Other options include synthetic leather or polycanvas.
If it's for your personal use I suggest you to get the leather exterior, it'sthe most comfortable bag for punching and his maintenance is pretty easy andquick.

The most commonly purchased bag is the heavy bag, the heavybag weight between 70 to 90 lb., this standard bags fit an adult person in the140 to 170 lb. you can find out moreinformation about customized punching bag that will fit you at https://www.profightshop.com/heavy-bag-2010-heavy-bags-punching-bags-&-kicking-bags-online-catalog-prod.html?srt=2d&products_id=221&cPath=6_58_59

Punching bag are often filled with rags, sand, and grains,there are also other bags who has an internal bladder that can allow them to befilled with air or water. Punching bags also designed to absorb the impact ofthe blow to avoid harming the puncher, good luck!