If you want one of those, check out my best robot vacuum buying guide. Eight hundred milliliters is the largest I’ve seen, but anything over 450 ml is decent on a budget bot. Another unique feature for a budget robot is the ability to set customized cleaning for each room, choosing from five suction levels and three water levels as well as three rotations. Best budget Roomba robot vacuumSuction power: unknown / Dustbin capacity: 419ml / Runtime: 90 minutes / Brush style: dual rubber / Auto-empty dock option: yes / Mopping option: yes / Mapping: yes / Keep-out zones: physical only / Works with: Amazon Alexa, Google Home, Siri ShortcutsThe Roomba i5 is the follow-up to my previous top pick for a budget robot, the Roomba i3. For $200, this is the perfect budget bot for those wary of or who don’t want to deal with an app and Wi-Fi.