I use to hold my son's bottle https://www.amazon.com/CamelBak-Chute-Bottle-Tritan-Hatching/dp/B08QVJ8ZPT/ref=sr_1_20?gclid=Cj0KCQiAic6eBhCoARIsANlox85yi7X_mQ1wBtVGnRvjXtXpq3nZVGaA9n5RphAan5oJkMGt3_4XXQ8aAgkYEALw_wcB&hvadid=153729759293&hvdev=t&hvlocphy=9031929&hvnetw=g&hvqmt=e&hvrand=3149039027426344622&hvtargid=kwd-2248556142&hydadcr=9407_9465190&keywords=camelbak%2Bwater%2Bbottles&qid=1674877157&sr=8-20&th=1
Little bulky though