I would say 30L is definitely on larger end of what most folks would think is an EDC. Personally, I think a big part of what is too big is how big it looks on you. A 30L bag on some who is 5'1 and 100lbs is very different then on someone that is 6'3 and 230lbs. I've used the TB Synik 30L as an EDC without any concerns.
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Their capacity lets you carry an extra layer, food and gear for day trips. 21–35 liters: This is the sweet spot for most hiking and travel daypacks. There's enough capacity to hold food, clothing and some extras, like a camera and a book.
Some feature extra pockets for staying organized. Their capacity lets you carry an extra layer, food and gear for day trips. 21–35 liters: This is the sweet spot for most hiking and travel daypacks. There's enough capacity to hold food, clothing and some extras, like a camera and a book.
The 30L pack is best suited for:1-bag-travel for trips 3 days and under. Day bag use: perfect for exploring, commuting, and working, in a new place, or in your hometown. Your carry-on personal item: fits more easily under airline seats.
You can check in any size luggage, but the most common checked bags are larger than typical 22” x 14” carry-on bags. The most popular size check-in luggage is 25- to 29-inches tall and various widths. Medium-sized check-in luggage measures 25-26” tall and around 18” wide.
Usually, many airlines won't check every carry-on but will instead go for ones that look oversized. If your luggage does not fit in the sizer, you might have to pay a checked bag fee along with the gate checking fee and have your bag transferred to the airplane's cargo.
Capacity: 35L. This luggage backpack is meet the allowed maximum size of most IATA flights and also fits in the overhead compartment and the underseat in flight. The portable opening facilitates you to quickly pass the airport security check.
The size restrictions for underseat luggage vary greatly between different airlines. It can range anywhere from 13 x 10 x 8 inches to 18 x 14 x 10 inches. But in general, if your underseat luggage is under 16 x 12 x 6 inches, it should be allowed on most airlines.