Choosing a bookcase often comes down to how much wall height you can spare and how many shelves you actually need. The Mainstays adjustable-shelf bookcases here cover both ends of that decision: a compact 3-shelf unit that stands about 31.65 inches tall and full-height 5-shelf units that reach around 71 inches. Prices range from $29.99 to $70.
Quick take
If your space can handle a full-height unit, the 5-shelf versions offer the most storage per footprint. If you need something short enough for a lower wall, dorm room, or corner, the 3-shelf model is the more practical pick. All the entries share an adjustable-shelf design, so the choice comes down to height, finish, and price.
Listed price comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| Mainstays 5-Shelf Bookcase with Adjustable Shelves, True Black Oak | $70.00 | |
| Mainstays 5-Shelf Bookcase with Adjustable Shelves, Rustic Oak | $40.99 | |
| Mainstays 5-Shelf Bookcase with Adjustable Shelves, White | $37.57 | |
| Mainstays 3-Shelf Bookcase with Adjustable Shelves, Rustic Oak | $29.99 |
Decision matrix
| Product | Shelf Layout | Finish | Key Detail |
|---|---|---|---|
| 5-Shelf True Black Oak | 3 adjustable shelves, 2 fixed shelves | True Black Oak | 11 in floor-to-bottom clearance |
| 5-Shelf Rustic Oak | 3 adjustable shelves, 2 fixed shelves | Rustic Oak | Assembled dimensions: 24.88 x 11.65 x 71.42 in |
| 5-Shelf White | 3 adjustable shelves, 2 fixed shelves | White | 71 in height |
| 3-Shelf Rustic Oak | 2 adjustable shelves, 1 fixed shelf | Rustic Oak | Assembled dimensions: 24.8 x 11.65 x 31.65 in |
Product notes
Mainstays 5-Shelf Bookcase with Adjustable Shelves, True Black Oak
At $70, this is the highest-priced entry in the comparison and the one that combines a true black oak finish with a five-shelf layout. The unit has a closed back, an 11-inch floor-to-bottom clearance, and the same adjustable plus fixed shelf mix found on the other tall units. Choose it when you want a darker, more anchored bookcase and don't mind paying more than the other options here. The trade-off is the price: if the black oak color isn't essential, one of the other 5-shelf models gives you the same amount of storage for less.
Mainstays 5-Shelf Bookcase with Adjustable Shelves, Rustic Oak
Priced at $40.99, this is the balanced option for a five-shelf bookcase in a lighter tone. The assembled footprint is 24.88 inches wide, 11.65 inches deep, and 71.42 inches tall, which makes it straightforward to plan around. It shares the same 5-shelf layout and adjustable shelving as the black oak model, so the main difference is the finish and the lower price. One thing to note: the title points to a four-color selection, while the color shown here is Rustic Oak, so treat that as the finish you are getting.
Mainstays 5-Shelf Bookcase with Adjustable Shelves, White
If you want five shelves in white, this is the model to look at. The unit includes a closed-back design with three adjustable and two fixed shelves, and it stands about 71 inches tall. At $37.57, it is also the lowest-priced 5-shelf entry in this group, making it a sensible choice when a bright finish is the goal and you want to stay under $40. The trade-off is color coordination: white will stand out against oak-toned or dark furniture, so consider the room before choosing it.
Mainstays 3-Shelf Bookcase with Adjustable Shelves, Rustic Oak
This is the compact and most affordable pick in the group. The 3-shelf version measures 24.8 inches wide, 11.65 inches deep, and 31.65 inches tall, which is a much shorter profile than the 5-shelf models. It has two adjustable shelves and one fixed shelf, with the fixed bottom shelf supporting up to 50 lbs and the adjustable shelves up to 35 lbs. Choose it for smaller spaces where a full-height bookcase would feel too heavy. The obvious limitation is total capacity: you get three shelves instead of five, and you'll need to store more items vertically or in other furniture.
Final recommendation by use case
- Tall five-shelf storage with a dark finish: Mainstays 5-Shelf Bookcase with Adjustable Shelves, True Black Oak, at $70.00
- Five-shelf height with a lighter oak tone: Mainstays 5-Shelf Bookcase with Adjustable Shelves, Rustic Oak, at $40.99
- Five shelves in white for less than $40: Mainstays 5-Shelf Bookcase with Adjustable Shelves, White, at $37.57
- Compact storage at the lowest listed price: Mainstays 3-Shelf Bookcase with Adjustable Shelves, Rustic Oak, at $29.99
