Genuine Clarke Nap Sac commercial backpack vacuum cleaner bags. 6 Bags per package. Fits Nap Sac models after series A! If your Clarke has an A at the end of your model, this is not the correct bag for you, any other letter then A, these bags are for your machine. Models that this bag wil fit include: 02132B, 02134B, 02136B, 02146, 02133B, 02135B, and 02137B. Genuine Clarke part number 61528A.