A "stackable" bonus is a series of bonuses that can be earned in a specific amount of time. Bonuses that run at the same time can have redemptions applied to both bonuses to earn faster!
A stackable bonus is a bonus that runs along the same time as one or more bonuses in the same series. A "series" is a group of bonuses with similar (or the same) names and are numbered. Each bonus may have a different start and end time within the specific time frame. This means that there may be multiple bonuses running at different times with portions of each bonus running at the same time. For you, this means that one (or more) redemption will apply to multiple bonuses in the same program.
Stackable Bonus #1 runs from 1/1/18-1/14/18. On 1/3/18, Stackable Bonus #2 pops up in the app and expires on 1/7/18. Then, on 1/10/18, Stackable Bonus #3 pops up in the app and expires on 1/14/18.
If you redeem a receipt with 4 redemptions (not any brand) on 1/5/18, you would receive 4 redemptions towards Stackable Bonus #1 AND 4 redemptions towards Stackable Bonus #2. If you redeem a receipt with 2 redemptions (not any brand) on 1/13/18, you would receive 2 redemptions towards Stackable Bonus #1 (in addition to the 4 previous redemptions) AND 2 redemptions towards Stackable Bonus #3.
Essentially, you can submit a receipt and receive redemptions towards more than one bonus running at that time. Ibotta will let you know if the bonus is stackable so you can plan your shopping and earn those bonuses!