Whats the purpose of the straw? Does the straw have holes along the length? If not how does the water flow once the level falls below the straw?

The air tube (straw) displaces the water in the bottle with air - otherwise there would be a vacuum when attempting to release the water. As air flows into the bottle through the air tube, the water is allowed to flow out the small holes in the cap. Without the tube, a vacuum forms and water will not leave the bottle unless the bottle is squeezed. As Dennis Schmit said, you can replace it with a flexible tube for ease of transport.

What is the flow rate of this when using a 2 liter bottle - how long does the shower last?

The flow rate is 1.8 gallons per minute, which means you'll get a 36 second flow from a 2 liter bottle. That is slightly less flow than a low flow shower, but it actually does a better job getting you wet/rinsing you off. While a single 2 liter bottle is sufficient for a "navy" shower, we recommend using two bottles for a complete shower (actually, I use 3 liters for a complete shower, but 4 liters works best for most people).

Will this fit Kirkland (costco) water bottles?

Hello - the first two GALLON water bottles I just tried it on aren't fitting. It does fit 2 liter soda bottles and 16 oz water bottles so far.

Do they make compact carry cases or ties for this product in order to store within a small travel backpack?

I purchased 2, I fit the straws in a pvc pipe with the closed ends, the tops in a plastic bag and secure together with a ranger band. If you’re backpacking you may want to use just a bag to save weight.

Brand	Simple Shower
Style	Modern
Shape	funnel with tube
Material	HDPE
Finish Type	Painted
Installation Type	Portable
Color	Black
Product Dimensions	2.5"L x 2.5"W
Number of settings	1
Number of Jets	1
Special Feature	Convertible Bottle Shower, Made from Recycled Material
UPC	696859301551
Item Package Dimensions L x W x H	12.28 x 2.48 x 2.28 inches
Package Weight	0.08 Kilograms
Item Dimensions LxWxH	2.5 x 2.5 x 12 inches
Item Weight	2 Ounces
Brand Name	Simple Shower
Country of Origin	United States
Model Name	FBA_SimpleShower
Number of Items	1
Manufacturer	Rainburst
Part Number	FBA_SimpleShower

Simple Shower Portable Camping Shower

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