Backpack with magnetic hydration tube return

1. A hydration backpack, comprising:

a main body defining a storage compartment;

a pair of shoulder straps coupled to the main body;

a bladder disposed in the storage compartment of the main body and configured to retain liquid;

a hydration tube comprising a proximal end coupled to the bladder and a distal end;

a first longitudinal elongated metallic element disposed on one shoulder strap of the pair of shoulder straps; and

a second longitudinal elongated metallic element disposed along a length of the hydration tube,

wherein the first and second longitudinal elongated metallic elements are configured to connect by gravitational and magnetic forces and disconnect by a force exceeding the magnetic force of the first and second longitudinal elongated metallic elements,

wherein the first longitudinal elongated metallic element is a first chain of magnets disposed end-to-end and the second longitudinal elongated metallic element is a second chain of magnets disposed end-to-end, and

wherein the first chain of magnets is disposed within a first sleeve coupled to the first shoulder strap and the second chain of magnets is disposed within a second sleeve coupled to the hydration tube.

2. The hydration backpack of claim 1 , wherein the first and second longitudinal elongated metallic elements are ferromagnetic, paramagnetic, superparamagnetic, or ferrimagnetic.

3. The hydration backpack of claim 1 , wherein the second longitudinal elongated metallic element is a magnet.

4. The hydration backpack of claim 1 , wherein the second sleeve is coupled to a third sleeve disposed about the hydration tube, wherein the third sleeve is configured to slide along a length of the hydration tube.

5. The hydration backpack of claim 1 , wherein the first and second chains of magnets are flexible.

6. The hydration backpack of claim 1 , wherein the first and second chains of magnets are cylindrical.

7. The hydration backpack of claim 6 , wherein the first and second chains of magnets each have a diameter of 1 to 5 mm and a length of 10 to 30 mm.

8. The hydration backpack of claim 1 , wherein the first and second chains of magnets each contain 3 to 9 magnets.

9. The hydration backpack of claim 1 , wherein the first and second chains of magnets are diametrically opposed.

10. The hydration backpack of claim 1 , further comprising a valve disposed at the distal end of the hydration tube, wherein the bladder comprises a fill port for transferring liquid to and from the bladder and a discharge port for transferring liquid from the bladder, wherein the discharge port is connected to the proximal end of the hydration tube.

11. The hydration backpack of claim 1 , wherein the first and second chains of magnets are each diametrically magnetized magnets arranged such that they are diametrically opposed with opposite polarity.

12. The hydration backpack of claim 1 , wherein the first and second chains of magnets are each radially magnetized magnets arranged such that they are radially opposed with opposite polarity.

13. The hydration backpack of claim 1 , wherein the first and second chains of magnets are each arranged such that they are opposed with opposite polarity.

14. The hydration backpack of claim 1 , wherein the first and second chains of magnets are each bendable magnets arranged such that they are opposed with opposite polarity.

15. A hydration system for providing liquid to a user on demand, comprising:

a backpack comprising a main body having a front side facing towards and adjacent to a user's back when the backpack is carried, a back side facing away from the user's back when the backpack is carried, and a pair of shoulder straps coupled to the main body and configured to extend over the user's shoulders and chest;

a bladder disposed in the main body of the backpack configured to retain liquid, the bladder comprising a fill port for transferring liquid to and from the bladder and a discharge port for transferring liquid from the bladder;

a hydration tube extending from the bladder through an opening in the main body and over the user's shoulder, wherein the hydration tube is configured to transfer liquid from a proximal end connected to the discharge port to a distal end;

a valve disposed at the distal end of the hydration tube including an outlet configured to discharge liquid into the user's mouth;

a first plurality of cylindrical magnets coupled to a shoulder strap of the pair of shoulder straps; and

a second plurality of cylindrical magnets coupled to the hydration tube,

wherein the first and second pluralities of cylindrical magnets are configured to connect by gravitational and magnetic forces when the hydration tube is released from the user's mouth and disconnect when the user exerts a force exceeding the magnetic force of the first and second pluralities of cylindrical magnets, and

wherein upon release of the valve from the user's mouth the second plurality of cylindrical magnets sequentially connects by magnetic force to the first plurality of cylindrical magnets.

16. The hydration system of claim 15 , wherein the first and second pluralities of cylindrical magnets are diametrically magnetized.

17. The hydration system of claim 15 , further comprising an adjustable sleeve disposed about the hydration tube and configured to slide along a length of the hydration tube, wherein the second plurality of cylindrical magnets is coupled to the sleeve and the magnets of the second plurality of cylindrical magnets are disposed end-to-end.

18. A hydration pack, comprising:

a main body defining a storage compartment;

a strap coupled to the main body;

a bladder disposed in the storage compartment of the main body and configured to retain liquid;

a hydration tube comprising a proximal end coupled to the bladder and a distal end;

a valve disposed at the distal end of the hydration tube;

a first longitudinal elongated metallic element disposed on the strap; and

a second longitudinal elongated metallic element disposed on the hydration tube,

wherein the first and second longitudinal elongated metallic elements are configured to connect by magnetic forces and disconnect by a force exceeding the magnetic force of the first and second longitudinal elongated metallic elements,

wherein the second longitudinal elongated metallic element is disposed between the bladder and the valve,

wherein the first longitudinal elongated metallic element is a first chain of magnets disposed end-to-end and the second longitudinal elongated metallic element is a second chain of magnets disposed end-to-end, and

wherein the first chain of magnets is disposed within a first sleeve coupled to the strap and the second chain of magnets is disposed within a second sleeve coupled to the hydration tube.

19. The hydration pack of claim 18 , wherein the main body is configured to be disposed against a user's back and the strap is configured to be disposed on a front side of the user.

20. The hydration pack of claim 18 , wherein the first and second chains of magnets are cylindrical.

21. The hydration pack of claim 18 , wherein the first chain of magnets is disposed along a lengthwise direction of the strap and the second chain of magnets is disposed along a lengthwise direction of the hydration tube.

22. The hydration pack of claim 18 , wherein the first and second longitudinal elongated metallic elements are configured to connect by gravitational forces.

23. The hydration pack of claim 18 , further comprising a second strap coupled to the main body.