I've had a few attempts at storage systems this past year, that didn't work well for me. Finally, I've got a system that works great

.
I took an old oak bookcase, removed most of the shelves, and bought an oak closet rod & brackets, at Menards. I stained them to match the bookcase and then cut to size & put the rod in the bookcase. I then went shopping, armed with measurements, and bought baskets that fit the shelves wonderfully!
I attached hooks to the side of the bookcase to hang leashes & harnesses on. I put potty pads in the bottom two baskets, bows, hair products, grooming supplies, life jacket, travel water bottles, folded blankets, and all that other miscellaneous stuff we collect for our pups, in the two rows of smaller baskets. In the baskets on top of the bookcase I stash all the extras & duplicates I buy for her (if I buy her a toy & it turns out to be really great and she loves it, I'll go buy a bunch more while I can!).
I love having a place for everything!