u/IAmNotANumber37

Hi, I'm really struggling to compare these two backpacks:

Waterproof Cycling Backpack 25 L - Speed 900 Black
Rolltop Backpack with Laptop Pocket, 22-29 L

Really, I think I just want whichever one has the largest main-compartment capacity. I want to use it for running errands (mostly groceries or takeout food) on my bike, where I've found my multi-compartment backpacks to be a nuisance. I just want one large compartment to jam stuff into.

Nominally, of course, 29L is bigger than 25L so the second one should fit more stuff. But maybe the 25L measurement is fully rolled and when partially rolled it fits more stuff? Also, I just don't trust the volume measurements.

Anyone familiar with these two?

Appreciative of any help.

Thanks!