bobp337449 wrote an answer about The North Face Base Camp Duffel Bag - 1525 - 9460cu in on July 3, 2014
I can vouch for Wayne's comment above--When I got my XL I carried my smallish 9 year-old, and later my largish 11 year-old in it. Not very far, but they each fit individually in kind of a fetal position with room to spare.
My sons' camp requires a hard-sided trunk because they live in tents/tipis and critters (mice presumably) would chew through fabric, even TNF duffels. The XL is actually smaller than the standard camp trunks you can find online, but my older two go for a month and the youngest had plenty of spare space in his trunk for his two week stay. The sagginess of a duffel makes it tough to carry, and the sheer size of the XL makes it tough for a small one to haul even in backpack mode. Even the trunks they don't carry (alone). The XL is 32 inches long, which in backpack mode would reach from my 9 year-old's shoulders to his ankles.