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Step 12Appendix 1: the hiking version of the homemade bite-valve system
The 1 psi (1/15th of an atmosphere) pop-off valve is not adequate to allow a pickup tube to draw from the bottom of a vertical, upright two-liter soda bottle for hiking purposes. The solution is to invert the bottle and draw from the bottom. Drawing from the bottom requires no pickup tube but it does mean that the pop-off valve is best kept protected inside the bottle, where it won't get knocked off. A hiking version of the bite-valve system is therefore the same as the cycling version except that
1. the hypo tubing and pop-off valve are on the inside;
2. there's no pickup tube;
3. it's more convenient to use a right-angle poly hose barb.
For the 2-liter horizontal bottle attached to the bicycle rack as shown on the first page, I used an external pop-off and a draw tube, although tilting the bottle a bit makes the draw tube unnecessary.
1. the hypo tubing and pop-off valve are on the inside;
2. there's no pickup tube;
3. it's more convenient to use a right-angle poly hose barb.
For the 2-liter horizontal bottle attached to the bicycle rack as shown on the first page, I used an external pop-off and a draw tube, although tilting the bottle a bit makes the draw tube unnecessary.
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