Price: $35.99

This Coroplast base is made from 4mm-thick corrugated plastic and is designed to be placed on the INSIDE of the Midwest Brand (and their knock-offs of the same size) wires. This size is 22.5" x 46.25" and replaces the NON-waterproof, canvas base of that cage. It is professionally cut and scored and includes reusable, plastic rivets to secure the corners. The "canvas" is not not truly cleanable and leaves trapped bacteria harboring smells and worse. The wires are not attached to the Coro base, but it's not necessary as the rigidity of the Coroplast keeps it in place.

The wire fencing is NOT included.

See our other Midwest Cage upgrades here.

Item #: CORO-BASE-MWST
Availability: In Stock

Midwest Cage Replacement Base

On the 10" wall option: We do not make cutouts for the two 6" openings because the six panels are interchangeable and can be configured in multiple locations. 

The 10" wall option is not returnable.


22.5" x 46.25" Coroplast base replaces the original canvas base.  No velcro straps needed; sits right inside the original fencing. Flaps fasten with rivets. All plastic, easy to clean and maintain.

Coroplast Base Includes

  • 4mm Coroplast bottom in your choice of 16 colors!
    The base is pre-cut and pre-scored with pre-punched holes to secure flaps using snap-in plastic rivets (not tape). Coroplast base is creased and folded for shipping, which creates an indented "crush" line. This does not affect the functionality of the cage and is behind the grid wall when assembled.
  • Rivets for fastening all coroplast flaps

WIRE fencing is not included.

Select your Options!

  • Green
  • Lime
  • Lemon Yellow
  • Cool Flame
  • Raspberry
  • Blueberry
  • Black
  • Silver
  • White
  • Celery / 2275 CP
  • Vanilla / 7499 C
  • Taupe / 4252 C
  • Gold / 7555 C
  • Melon / 2026 C
  • Red / 200 C
  • Dusty Rose / 6064 CP
  • Wine / 4084 C
  • Fuchsia / 253 C
  • Periwinkle / 3558 C
  • Frost Blue / 291 CP
  • Sky Blue / 305 C
  • Royal Blue / 2145 C
  • R - Cool Splatter - White
  • R - Geo Cubes - White
  • R - Geo Cubes - Black
  • R - Pretty Petals
  • R - Leaf Motif
  • R - Floral Reflections
  • R - Heart Quake

2nd's on some bases are discounted as they have some cosmetic flaws, but are fully functional, not returnable & not available in 10" walls. PRINTED colors (+$) & Patterns have an upcharge & are printed on white coro. More color info here. Please note: Custom colors & patterns will be printed on the WALLS ONLY - inside and out.

(note: PINK, Violet, and Navy are Out of Stock until June)


  • 4 inch walls
  • Backwall=12" / 3 sides=4"

The 12"-high wall option is on the LONG back wall, not the 2-grid end wall.
Coro bases with 10" walls are NOT returnable and not available on LOFTS.





Customer Reviews

Overall Customer Rating of 7 Reviews:
review-star review-star review-star review-star review-star

Coroplast base

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
The base was perfect for my Midwest habitat. The Midwest cage purchased needed additional support- only had a canvas bottom. My guineas are safe poppinh on a strong bottom. 🤗

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
This is my 3rd time buying g these wonderful liners. I highly recommend them for people, like myself, who have the Midwest cage set up for their fur kids.
I have found that they stabilize the grids and are a lot easier to keep clean.

Looks so good!

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
Just put the base together for my girls! Fast shipping, easy to put together, and the cage looks so much better!

BEST MIDWEST LINERS

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
This like the other Coro pieces I have are wonderful, easy to assembly and are of great quality- now Pattern colors as well- woohoo🥰

GP Coroplast

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
Amazing service with amazing products.

Salt Lake City UT

Wonderful quality and so easy!

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
Terrific liner. The quality that we all know and love from guinea pig cage store! Nice color (denim blue). Super easy to set up. And what a great price, too!

works with 12" grids

Product:
review-star review-star review-star review-star review-star
Service:
review-star review-star review-star review-star review-star
My cage is 2x4 but uses 12" grids. This fits perfectly inside the connectors and is much nicer than the base I cut myself. Definitely worth the money!

You May Also Like

Midwest Mezzanine shown with a Coro Base

Kitchen Suite for Midwest Cages

Price: $58.99

Coroplast Base Only - Small Coro for Guinea Pig C&C Cages by Cagetopia shown in Pink

Small (2x3 Grids) Coro Base for Guinea Pig C&C Cages

Price: $31.99

Coroplast Base Only - Medium - Coro for 2x3.5 Guinea pig C&C Cages by Cagetopia shown in Navy

Medium (2x3.5 Grids) Coro Base for Guinea Pig C&C Cages

Price: $34.99

Coroplast Base Only  Large 2x4 Grid-sized Coro base for C&C Guinea Pig Cages by Cagetopia shown in Raspberry

Large (2x4 Grids) Coro Base for Guinea Pig C&C Cages

Price: $41.99

Recently Viewed Items

Coroplast Base for a Midwest Habitat Guinea Pig Cage by Cagetopia

Coroplast Base for Midwest Habitat Cages

Price: $35.99