I'll go ahead and say what I want, I think the creel space should act similar to the belt space, reducing all fish put into it down to one tile.
Now to get on to why:
Currently, as it stands the creel can hold:
36 Small Fish (1x1)
16 Medium Fish (2x1)
12 Large Fish (3x1)
Do you know what does all of this like 2x better past the medium fish mark? A wheelbarrow. Slap one of those guys in your rowboat and you'd be good to go right?
Now let's examine the costs, not via the number of ingredients, but the tiers needed. Assume dried hide is obtained day 2, then day 3 one should have leather correct? The only difference between a creel and a wheelbarrow is one day. Meaning that it takes literally one day to make the creel obsolete in storage space. I can hold 60 fish in a rowboat if I wanted using wheelbarrows.
Just take it into consideration at least. I'm sure there is something I'm missing on the usefulness of a creel right?.... Right?
EDIT: Just a quick side note, I wouldn't be making this post if I didn't like the idea of the creel. I have a desire to use it but can't shake the feeling it just doesn't work as well as already present tools. Also IT LOOKS SO FUCKING FASHIONABLE GHAT DAYUM.
