The size and type of bin liner you need primarily depends on the bin. You can find appropriate sized bin liners for pedal bins, swing bins and bins of other shapes and sizes, including square and rectangular bins. It’s a good idea to check the dimensions of your bin, and the dimensions of the bin liner, before buying.
If you’ll be using bin liners for other tasks that don’t involve a bin, you’ll need to consider what will be disposed of in the bags. Standard bin liners are suitable for general waste, while for heavy duty, commercial or industrial waste, a specialist bag or liner will be needed.
Remember that the larger the bin bag and the more you fill it, the greater the weight. Unless the bin liner is strong enough for the task, it could lead to rips, tears and spills.