A holder comprising a connecting portion, an extension portion, and a receptacle; the connecting portion comprising a generally rectangular piece of material generally conforming to the shape of a channel; the connecting portion comprising an upper portion comprising a spring element biased in an expanded position such that connecting portion vertical dimensions may be reduced to fit within the channel, and upon insertion within the channel expanded to fill the space; a lower portion of the connecting portion being angled to permit easier insertion with the channel; the extension portion is pivotally attached to the connecting portion; and the receptacle comprising a base portion may be cooperatively coupled to a lower surface of the extension portion such that the holder may be collapsed when not in use.