I save strips that are at least an inch wide and four inches long. Odd shapes have to be over two inches wide. If you don't use the scraps you will soon have more scraps then fabric to store. Have a pile of string or scrappy blocks ongoing to use the scraps as you go. I take my scrap barrel (use to be small bin) when it's overflowing to guild and and dump it on a table and I start sorting. Dump it and they will come! LOL. With all the help my scraps are sorted and lots given away to live somewhere else.