# Breast pump milk output per session How much milk does each breast pump remove per session? Medela Swing Maxi Hands\-Free: The store claims the collection cups' 105° open angle results in 11\.8% more milk\. Each hands\-free collection cup holds up to 5 oz / 150 mL of breast milk\. The video shows the hands\-free kit has three collection\-cup parts, a lanyard, built\-in rechargeable battery and USB charging, plus two breast\-shield sizes\. Willow Pump Willow Go: In testing it expressed the same number of ounces as a Spectra S1\. Willow Go is marketed with hospital\-strength suction up to 295 mmHg\. Medela Harmony Manual Breast Pump: A parent review reports collecting 110 mL on the first use and about 90 mL in 10 minutes on most mornings\. It needs no electricity or battery\. ### 1. [Medela Swing Maxi Hands\-Free](/products/ucp/lovemedobaby-com/6707252789382) (sold by lovemedobaby\.com) The store claims the collection cups' 105° open angle results in 11\.8% more milk\. - Milk output: The store claims the collection cups' 105° open angle results in 11\.8% more milk\. (listing) - Suction or capacity: Each hands\-free collection cup holds up to 5 oz / 150 mL of breast milk\. (guide) - Power: The video shows the hands\-free kit has three collection\-cup parts, a lanyard, built\-in rechargeable battery and USB charging, plus two breast\-shield sizes\. (review) ### 2. [Willow Pump Willow Go](/products/ucp/onewillow-com/6705010016349) (sold by onewillow\.com) In testing it expressed the same number of ounces as a Spectra S1\. - Milk output: In testing it expressed the same number of ounces as a Spectra S1\. (review) - Suction or capacity: Willow Go is marketed with hospital\-strength suction up to 295 mmHg\. (guide) - Power: - ### 3. [Medela Harmony Manual Breast Pump](/products/ucp/lovemedobaby-com/2214800835) (sold by lovemedobaby\.com) A parent review reports collecting 110 mL on the first use and about 90 mL in 10 minutes on most mornings\. - Milk output: A parent review reports collecting 110 mL on the first use and about 90 mL in 10 minutes on most mornings\. (review) - Suction or capacity: - - Power: It needs no electricity or battery\. (guide) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-31T08:50:03.150Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)