Stuff the wife finds / buys... https://www.amazon.com/GoPong-Bottle-Sunscreen-Funnel-Liquor/dp/B01DF6VVLM/ref=sr_1_6?s=kitchen&ie=UTF8&qid=1489424389&sr=1-6&keywords=sunscreen+flask I said - aren't people going to look at you weird by the pool if your drinking out of a bottle of sun screen? "I'll pour it into the cup, while hiding it in the beach bag I bring" What is the open beverage policy on the strip anyway? Tolerated so long as you don't do anything stupid?
We use fake flasks for concerts and sporting events all the time. Hand lotion is a good one, you can use that all year while the sunscreen fake's would look suspicious in the winter I remember when I was 8 or 9 my dad and Uncle had binocular flasks at a Packer/Bears game. I was totally confused as to what they were doing putting it up to their mouth.
One of the funniest Amazon reviews of all time was written about a 64 ounce flask. Although the flask is no longer available here is the original review... "I'm a clown who likes a 10-12 oz. nip at the spirits every now and again, before each performance, or when I'm alone. I can say that this flask is perfect for me. My other flasks were always getting lost in my comically oversized pants pockets amidst the confetti, balloon animals, and ropes of colored handkerchiefs. It was nearly impossible for me to quickly find and swig from these puny things, not to mention they did almost nothing to satiate my thirst for liquid comedy. I tried just using the bottles my zany sauce was originally packaged in, but quickly found I needed something more discreet when performing before uptight prudish children and the priggish parents who love to scream and yell about their morals. Not to mention glass is breakable. That doesn't combine well with my specialty trick, constant pratfalls and collapsing in heaps. Then I found this 64 oz. paragon of discretion, and my hollow void now has one shining object. I've incorporated my frequent swigs into the act, and the stupid kids are none the wiser. I mean, it's opaque. They don't know what's in there, and I keep getting funnier until I somehow wake up in the park."
The "No Glass Bottles on the Strip" rule actually went into effect in Sept 2014: https://lasvegassun.com/news/2014/sep/16/glass-bottles-no-longer-allowed-las-vegas-strip/
Vegas rule is simple "If you are drinking outside, you had better bought that drink from a casino." Downtown problem for casinos was people who bought a case of beer and a cooler from Walgreens but used Fremont Street and their restrooms without paying. The Strip problem was people bashing other people over the head with bottles and glasses. Insist that all drinks be in plastic cups and you can eliminate both problems and identify the rule breakers. So use whatever flask you choose, if you thought it this far through you are not the problem.
