Bedside commodes are available in a variety of sizes to accommodate the different needs and preferences of users. The most common sizes of bedside commodes include: 

1. Standard: Standard size bedside commodes typically have a seat height of around 16 to 20 inches and a weight capacity of up to 300 pounds. They are designed to fit most average-sized adults. 

1. Bariatric: Bariatric bedside commodes are designed for larger patients and typically have a weight capacity of 400 pounds or more. They may also have a wider seat and a sturdier frame to support the additional weight. 

1. Pediatric: Pediatric bedside commodes are designed for children and typically have a smaller seat and a lower weight capacity. They may also be more colorful or playful in design to make the commode more appealing to children. 

1. Folding: Folding bedside commodes are designed to be easily collapsible for storage or transport. They may be a good option for patients who travel frequently or who have limited space in their home. 

1. Drop-arm: Drop-arm bedside commodes have arms that can be lowered or raised for easier transfers and positioning of the patient. They may be a good option for patients who have limited mobility or require assistance with transfers. 

1. Extra-tall: Extra-tall bedside commodes are designed for patients who are taller than average and require a higher seat height. They may also have a higher weight capacity to accommodate larger patients. 

The specific sizes and weight capacities of bedside commodes will vary depending on the manufacturer and model. Patients and caregivers should consult with their healthcare provider or medical equipment supplier to determine the best size and type of commode for their individual needs.