Abstract: A bag filler which is particularly suited for filling of yard waste bags. The bag filler has a top funnel with a descending collapsible loading nozzle. The loading nozzle is inserted within a waste bag and waste is loaded into the funnel to channel it into the bag. The wide inlet of the funnel increases the effective mouth area of the bag, making the bag easier to fill. The loading nozzle is preferably configured to allow it to be selectively locked into various lengths between fully extended and fully collapsed lengths. The length of the loading nozzle can thus be configured to fit bags of varying depths. Bag-retaining structure may be provided on the funnel and/or loading nozzle to allow attachment of a bag rim about the bag filler so that a bag is held in an open state with the nozzle resting therein.