So I love my 5L All Night Festival Bag and it is almost perfect except for travel I wanted something I could put a water upright in (I usually use a Swell 17 oz), a light jacket, wallet, keys, some lipstick, and glasses case. I found the 10L on Poshmark for a reasonable price. The original description wasn’t lying when it said it could be a gym bag (I am always kind of skeptical of actual measurements). I wanted crossbody vs. (something like) a Longchamp Le Pliage bag that only has shoulder straps. I am a little nervous I may not use it a ton or it might just be too big than for anything but a personal item on an airline. Thoughts (especially if you own or owned this bag)?