Mizu Loop Cap vs V Series Stainless Steel Cap Compared
By Mizu Life: Mizu Stainless Steel Water Bottles, Reusable ... | Published: 2026-10-14
Category: Comparisons
The V Series Stainless Steel Cap is the choice for a plastic-free, stainless steel bottle top. The Loop Cap wins on lightweight, low-cost carry. Here's how to pick and swap.
Quick Answer
Choose the V Series Stainless Steel Cap if you want a plastic-free 18/8 stainless steel top for your V Series narrow-mouth bottle. Choose the Loop Cap if you want a lighter, lower-cost BPA-free cap that fits every M Series and V Series narrow-mouth bottle and gives you a carry loop. The trade-off is simple: stainless steel purity versus light, versatile carry.
Material and What It Means for Your Daily Routine
The V Series Stainless Steel Cap is made from 18/8 food grade stainless steel, so the cap itself is metal rather than plastic. For anyone who wants to avoid plastic touching their water, that difference is the whole point of the cap. It is also heavier and taller than the Loop Cap, which is a real consideration if you carry your bottle by hand for long stretches.
The Loop Cap is BPA free and built with a carry loop, which makes it easier to clip to a bag or hook a finger through on a walk. It is noticeably lighter and shorter, so it disappears into a commute bag and does not add bulk. Neither cap is insulated, so do not expect either one to change how long your drink stays cold.
Fit: Which Bottles Each Cap Actually Works With
This is where the two caps diverge most. The V Series Stainless Steel Cap fits all V Series bottles only. The Loop Cap fits all M Series and V Series bottles, so it is the more flexible spare to keep in a drawer. If you own both an M Series and a V Series bottle, the Loop Cap is the one cap that can move between them.
If you are set on a stainless steel top for an M Series bottle, the M Series Stainless Steel Cap is the matching option, since the V Series stainless cap will not fit M Series threads. Check the series name on your bottle before ordering, because the caps are not interchangeable across every Mizu narrow-mouth model.
Trade-Offs to Weigh Before You Swap
- Plastic-free vs carry loop: The V Series Stainless Steel Cap gives you an all-metal top, but no loop and no color variety beyond its finish. The Loop Cap gives you a loop and a wide range of colors, but the cap body is BPA-free plastic. Pick stainless if avoiding plastic is the priority; pick the loop if hands-free carry matters more.
- Weight and height: The V Series Stainless Steel Cap is 1 oz and 1.5 in tall. The Loop Cap is 0.8 oz and 2.8 in tall. The stainless cap is slightly heavier but shorter; the loop cap is lighter but taller because of the loop. For pocket or slim sleeve carry, the shorter stainless cap sits lower; for bag clipping, the loop cap is easier to grab.
- Fit range: The V Series Stainless Steel Cap fits V Series bottles only. The Loop Cap fits both M and V Series narrow-mouth bottles. If you own one bottle, match the cap to its series; if you own both, the Loop Cap is the safer single spare.
Cap Specs at a Glance
- V Series Stainless Steel Cap: 18/8 food grade stainless steel cap, 1.5 in tall, 1.9 in diameter, 1 oz, fits all V Series bottles. This is the plastic-free option for V Series owners, with a compact height that keeps the bottle profile low.
- Loop Cap: BPA free narrow-mouth loop cap, 2.8 in tall, 1.8 in diameter, 0.8 oz, fits all M and V Series bottles. The lighter cap and built-in loop make it the better pick for clipping to a bag or sharing across M and V Series bottles.
- M Series Stainless Steel Cap: 18/8 food grade stainless steel cap, 1.7 in tall, 1.9 in diameter, 1.1 oz, fits all M Series bottles. M Series owners who want the stainless steel look need this cap instead of the V Series version.
Which Cap Should You Choose?
Best for
- V Series owners who want a plastic-free 18/8 stainless steel cap
- Buyers who prefer a shorter, all-metal profile over a carry loop
- Anyone replacing a worn cap and wanting a simple metal top
Not for
- M Series owners, who need the M Series Stainless Steel Cap instead
- People who want a loop for clipping the bottle to a bag
- Buyers who want the lightest possible cap for long carries
