I've seen two types the dedicated uppercut bags like here http://store.everlastboxing.com/everlast-uppercut-bag.html and the sort of ring which goes round a normal bag like this http://www.karatesupply.com/uppercut_bag.htm or http://www.everythingfitness.com/catalog/images/items/large/tr-bg-021.jpg Anyone have any of these products ?
I have used bags like the ones in the first and third links, Biggie. I much prefer the first one myself, but I really think it's an issue of personal preference.