What 'Suckolux' said...
Agreed. It sounds like a bag problem. Fortunately, 'C' bags are plentiful and cheap. The best bang for your buck will be to order them in bulk from eBay. I got 24 for $15.45 with free shipping earlier this year. The offer is still there (see link below). If you've got the cash, an even better deal is 100 for $39.99 shipped, to which you will see a link on this listing. These are good quality four-ply generic bags and I can attest to their excellent performance. And no, I am not a paid spokesperson.
[URL unfurl="true"]http://www.ebay.com/itm/24-Bags-for-Electrolux-Canister-Vacuum-Style-C-4-Ply-/261785140991?pt=LH_DefaultDomain_0&hash=item3cf39c3eff[/URL]
