Holder for use in disposable feeding systems

A holder for use in disposable feeding systems includes a body which is made from two straight pieces or sections capahle of being arranged in an abutting, end-to-end relationship in which they assume a non-coaxial arrangement that results in an angular body shape designed, for instance, to promote infant feeding in a semi-upright position. From this feeding position, the body sections of a transformable embodiment can be moved to a filling position, in which they are arranged coaxially to form a straight body shape that facilitates the insertion and/or filling of a disposable liner. The body sections of both the transformable and non-transformable embodiments may also be provided with finger guides, which promote the proper gripping of the holder by a user, and finger holes, which facilitate the expulsion of air from a liquid-filled liner receivable in an interior of the holder.