Why is it difficult to suck water through while using the hydration belt?

I would hydration bag position. I have to be careful my bag does get too low in my backpack. That causes a kink in the bottom of the bag and I get no flow through the tube.

how stiff is the tube? I want to wear under a beekeeping suit, so I need the tube to stick up from collar or lower rim of beekeeping veil.

It is not stiff at all. Very floppy. But you could tape some wire, pipe cleaner, or anything else to it that allows you to adjust it and hold it in position. I use it with a motorcycle helmet so I would think you will have to be creative with mounting as well. But once you get it in place, it works very well. I love it.

Brand	USWE
Colour	Black & Gray
Age Range (Description)	Adult
Size	One Size
Special Feature	Hands-free
Model Name	101004
Outer Material	Plastic
Recommended Uses For Product	Riding
Item dimensions L x W x H	21 x 17 x 10.2 Centimeters
Athlete	cycling
Inner Material	Expanded Polystyrene
Item Weight	0.1 Kilograms
Style	Performance
Global Trade Identification Number	07350069250049
Department	unisex-adult
Manufacturer	USWE
Country of Origin	USA
Item model number	101004
ASIN	B00H79TPVM

USWE 101004 GP Helmet Handsfree Hydration System

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