I have the Speedy B 35 in mono and I totally regret it because of the size. I also noticed a month after using it, the leather strips on the side are wrinkled . I never use it crossbody and I never store my bags folded so I know thats not the issue. Quite upsetting, I never thought about bringing it into LV to have it looked at because Im pretty sure they will say its normal. But I dont think it would/should happen so soon. Even my strap is wrinkled.I purchased the Speedy B 30 DE and I havent had any issues whatsoever.
I have the mono 25 speedy b since sept/Oct. It has natural untreated leather/skin. So it's bound to have some wrinkle to it as you use it. I never worried about it, I just enjoy wearing my bag.