What do you usually bring in the boat with you? It’s hard to bring a backpack when you’re in a bowloader and you can barely move your arms…
I coxed a few bow loader fours in high school and my bag then consisted of a drawstring Nike bag, which was easily contorted to fit whatever space I was in. I’d take a wrench or two, some extra spacers, one rigger’s worth of nuts and bolts, my recorder, my phone, a pen/pencil, a small notebook, Hot Hands (depending on the weather), sunscreen, and a LOT of band aids and tape. I’d generally sit in my lap so it wasn’t getting totally crushed and to prevent it from getting wet should any water get into the boat.