
They work quite well. However, they have a very small opening that requires a funnel (included) to fill. I never thought about it until I saw similar ones at the grocery store, with a wider opening that can be filled without special accessories. Much better solution. So you are decent. But I would advise you to find the ones with bigger mouths.

Portzon Women'S Waist Trainer: Weight Loss, Sweat Belt, Sauna Trimmer, Tummy Toner, Lumbar Support
47 Review

Foxelli Wading Boots: Lightweight, Rubber Sole Fly Fishing Shoes For Men - Grey
47 Review

6 Pcs Reflective Bands: High Visibility Running Gear For Women Men - Safety Straps Bracelets For Running, Cycling & Walking
46 Review

Smart bracelet Xiaomi Mi Smart Band 6 CN, black
50 Review