The niche "convenience and practicality" in the world of bags has long been occupied, it is occupied by backpacks. https://denimgrace.com/what-beach-bag-you-have-to-choose-in-2020/
Cycling, training. Small models up to 20 liters, so only the most necessary things can be put in them. Cycle backpacks must meet the requirements: aerodynamics, tightness, freedom of action of the cyclist. A set of things is calculated for 2-3 hours of riding: water, T-shirt, first aid kit.
Cycling, tourism. Volume up to 30 liters. This range is suitable for full day skiing.
Cycling models are similar to urban models, but there is one important difference: a mesh back for breathing back.