Expandable preformed liners

1. A preformed liner for holding a liquid for a bottle assembly, the preformed liner comprising:

a neck section that extends along a longitudinal axis of the liner, said neck section having a cylindrical shape with an axial extent, and an open top end;

a base section depending from said central section along said longitudinal axis, said base section having a closed bottom end, and

a central section disposed between said neck section and said base section along the longitudinal axis, wherein said central section comprises a plurality of axially extending flutes wherein said plurality of axially extending flutes do not extend into said neck section.

2. The preformed liner as in claim 1 , wherein said central section expands between an unfilled internal volume and a filled internal volume by more than about 110%.

3. The preformed liner as in claim 1 , wherein said central section expands between an unfilled internal volume and a filled internal volume up to about 170%.

4. The preformed liner as in claim 1 , wherein said central section expands between an unfilled internal volume and a filled internal volume between about 150% to about 160%.

5. The preformed liner as in claim 1 , wherein said central section comprises an expandable or stretchable elastomeric material that can stretch radially from said longitudinal axis and collapse radially inward toward said longitudinal axis.

6. The preformed liner as in claim 1 , wherein said central section comprises an expandable or stretchable elastomeric material that can stretch radially from said longitudinal axis and collapse radially inward toward said longitudinal axis.

7. A preformed liner for holding a liquid, the preformed liner comprising:

a neck section having an open top end;

a central section depending from said neck section along a longitudinal axis; and

a base section depending from said central section along said longitudinal axis, said base section having a closed bottom end and a generally frusto-conical shape that decreases in diameter from said closed end towards said central section,

said central section having a plurality of axially extending flutes separated by a plurality of divider walls, said plurality of flutes and divider walls extending along said longitudinal axis, wherein each of said plurality of divider walls intersect said base section at a location of decreased diameter away from said closed end of said base section, said plurality of flutes being expandable radially from said longitudinal axis when the liner is filled with liquid and being collapsible radially inward toward said longitudinal axis when liquid is withdrawn from the liner.

8. The preformed liner as in claim 7 , wherein said base section has a generally frusto-conical shape that decreases in diameter from said closed bottom end upwards along said longitudinal axis towards said central section.

9. The preformed liner as in claim 7 , wherein said central section has a generally cylindrical shape with a first taper that increases in diameter from said base section upwards along said longitudinal axis towards said neck portion.

10. The preformed liner as in claim 9 , wherein said first taper comprises an angle with respect to said longitudinal axis of between about 5 degrees to about 30 degrees.

11. The preformed liner as in claim 7 , wherein said closed bottom end has an outer diameter that is less than an inner diameter of said open top end.

12. The preformed liner as in claim 7 , wherein each flute of said plurality of flutes comprises a generally semi-circular cross sectional shape.

13. The preformed liner as in claim 7 , wherein each flute of said plurality of flutes comprises a cross sectional shape selected from the group consisting of a semi-circle, a polygon, an oval, and any combinations.

14. The preformed liner as in claim 7 , wherein said plurality of flutes are uniformly distributed about a circumference of said central section.

15. The preformed liner as in claim 7 , wherein said plurality of flutes comprises between about four and about twelve flutes.

16. The preformed liner as in claim 7 , wherein said plurality of flutes comprises between about six and about ten flutes.

17. The preformed liner as in claim 7 , wherein said plurality of flutes comprises about nine flutes.

18. The preformed liner as in claim 7 , wherein said plurality of flutes expand between an unfilled internal volume and a filled internal volume by more than about 110%.

19. The preformed liner as in claim 7 , wherein said plurality of flutes expand between an unfilled internal volume and a filled internal volume up to about 170%.

20. The preformed liner as in claim 7 , wherein at least said central section comprises an expandable or stretchable elastomeric material that can stretch radially from said longitudinal axis and collapse radially inward toward said longitudinal axis.

21. A bottle assembly comprising:

a holder having an open top;

a preformed liner having a neck section having an end with a rim, a base section, and a central section that is disposed between said neck section and said base section, said base section having a closed end and with a generally frusto-conical shape that decreases in diameter from said closed end towards said central section;

wherein said central section has a plurality of axially extending flutes that extend from a portion of said base section having a decreased diameter to said neck section opposite said rim, said preformed liner being disposed in said holder so that said rim rests on said open top; and

a retaining rim removably securing a nipple and said rim, in an airtight manner, to said holder over said open top.

22. The bottle assembly as in claim 21 , wherein said preformed liner, when in said expanded position, is substantially equal to a maximum internal volume of said holder.

23. The bottle assembly as in claim 21 , wherein said plurality of flutes move to a collapsed position with respect to said longitudinal axis.

24. The bottle assembly as in claim 21 , wherein at least said central section comprises an expandable or stretchable elastomeric material that can stretch between said normal position and said expanded position.

25. The bottle assembly as in claim 21 , wherein at least said central section comprises an expandable or stretchable elastomeric material that can stretch between said normal position and said expanded position.

26. A method of assembling a baby bottle, comprising:

inserting a preformed liner into an open end of a holder along a longitudinal axis of said preformed liner until a rim of the preformed liner rests on said open end, wherein said preformed liner comprises a neck section having a cylindrical shape, a base section and a plurality of flutes disposed along said longitudinal axis and between said neck section and said base section and wherein said plurality of flutes taper from said neck section towards said base section; and

filling said preformed liner with liquid until said plurality of flutes expand radially outward from said longitudinal axis such that said preformed liner contacts an inside of said holder.

27. The method as in claim 26 , wherein said preformed liner comprises an expandable or stretchable elastomeric material and wherein said filling step comprises filling said preformed liner with liquid until said elastomeric material stretches so as to contact an inside of said holder.

28. The method as in claim 26 , wherein said preformed liner comprises an expandable or stretchable elastomeric material and wherein said filling step comprises filling said preformed liner with liquid until said elastomeric material stretches so as to contact an inside of said holder.

29. The method as in claim 26 , further comprising attaching a nipple to said open end in an airtight manner.

30. A preformed liner as in claim 1 , wherein said plurality of axially extending flutes are formed along the entire longitudinal axis of said liner, from said neck section to said base section.