Right now there are 31 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Sports & Outdoors › Outdoor Recreation › Camping & Hiking › Hydration & Filtration › Flasks. These are inspected returns and open-box items that Amazon sells and ships itself. WarehouseHunter puts each one next to its current new price, so you can see what you save at a glance.

Brands with the most offers here: HydraPak, IRON °FLASK, Hydro Flask, STANLEY, Stansport, Gymreapers, INOXTO, Osprey. Every item is a one-off, so the stock moves all day and new deals keep arriving.