Brown Flat & Satchel Paper Bags - Flat Paper Bags are your standard sandwich type of bag, with no base or side gusset. All Flat Paper Bags are strung. Satchel Bags have a side gusset to give the bag more depth, to fit chunkier products like Rolls or Garlic Bread. OPB has a huge range of sizes to choose from. OPB ECO-GUIDE 4/4-SUPERB. Click camera icon to see pics.