Y'all got me thinking about sizes and lockers so I found this on Universals website
All-Day Locker Rentals
Guests have unlimited access to these lockers during the course of the day. Lockers are available on a firstcome, first-served basis. Please see a park attendant or concierge for assistance.
Universal Studios Florida™ and Universal’s Islands of Adventure™
Large lockers measuring 12” x 13” x 16.9” are available to rent near the park entrances of Universal Studios Florida™ and Universal’s Islands of Adventure™ starting at $10 per day. Family-size lockers measuring 12” x 16.25” x 16.9” are available at Universal Studios only, starting at $15 per day.
Universal’s Volcano Bay™
Lockers can be found in the Rainforest Village, River Village and Wave Village of Universal’s Volcano Bay™. There are three different locker sizes available: mini, regular, and family ($9, $13 and $16 respectively).
Single-Time Use Lockers at Attractions
Single-time use lockers are available at the attractions listed below. The standard-sized lockers (14 in x 5.5 in x 16.9 in) for small loose articles are free while you ride. Larger lockers (12 in x 13 in x 16.9 in) for oversized items can be rented for $2 during the posted wait time and an additional $3 per 30 minutes, with a $20 per day maximum. These lockers are available at the entrance of the following attractions:
Universal Studios Florida™
✔ Revenge of the Mummy™
✔ MEN IN BLACK™ Alien Attack™
✔ Hollywood Rip Ride Rockit™
✔ Harry Potter and the Escape from Gringotts™
Universal’s Islands of Adventure™
✔ The Incredible Hulk Coaster®
✔ Harry Potter and the Forbidden Journey™
The following water-based attractions offer single-time use lockers starting at $4 during the posted wait time and an additional $3 per 30 minutes to a maximum of $20 per day.
✔ Jurassic Park River Adventure™
✔ Popeye & Bluto’s Bilge-Rat Barges®
✔ Dudley Do-Rights Ripsaw Falls®