Curated list · Water Bottles
Slim water bottles for backpack side pockets
We compared 15 bottles that meet these criteria. The lightest is the SilverAnt Titanium Double-Wall Insulated Thermos Flask 400ml/14fl oz at 0.5 lb, and prices start at $5.50.
By Everyday LoadoutData checked 15 bottles comparedHow we compare
At a glance
- SlimmestSilverAnt Titanium Double-Wall Insulated Thermos Flask 400ml/14fl oz65 mm (2.6 in)
- Lowest priceNalgene 16oz Wide Mouth Ultralite Bottle$5.50 at Nalgene store, white
- Lightest per literNalgene 16oz Wide Mouth Ultralite Bottle120 g per liter
- Longest coldKlean Kanteen 12oz Classic with Loop Cap63 hours cold
- LightestCNOC Outdoors ThruBottle0.1 lb · 53 g
Side-by-side specs
Image not availableColor not published
The SilverAnt Titanium Double-Wall Insulated Thermos Flask 400ml/14fl oz is a 400 mL (14 fl oz) insulated titanium water bottle that weighs 240 g and is 65 mm across. Its body is titanium and the brand says it keeps drinks hot for 6 hours.
It's the 8th lightest of the 15 bottles here. Worth knowing: not dishwasher safe.
- Capacity
- 400 mL (14 fl oz)
- Weight
- 0.5 lb · 240 g
- Material
- Titanium
- Diameter
- 65 mm (2.6 in)
- Lid
- Not published
$99.99at SilverAnt store
Check price for the SilverAnt Titanium Double-Wall Insulated Thermos Flask 400ml/14fl oz at SilverAnt store (opens in new tab)Full specs and sources for the SilverAnt Titanium Double-Wall Insulated Thermos Flask 400ml/14fl ozLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 65 mm across
- Vacuum insulated
- Leakproof
Worth knowing
- Not dishwasher safe
- Sold by one retailer we track (SilverAnt store)
Image not availableColor not published
The SilverAnt Titanium Water Bottle Wide Mouth Screw Top is a 400 mL–600 mL (14–20 fl oz) titanium water bottle that weighs 128 g and is 65 mm across. Its body is titanium and it ships with a screw cap.
It's the 5th lightest of the 15 bottles here. Worth knowing: not dishwasher safe.
- Capacity
- 400 mL–600 mL (14–20 fl oz)
- Weight
- 0.3 lb · 128 g
- Material
- Titanium
- Diameter
- 65 mm (2.6 in)
- Lid
- Screw cap
$55.99at SilverAnt store
Check price for the SilverAnt Titanium Water Bottle Wide Mouth Screw Top at SilverAnt store (opens in new tab)Full specs and sources for the SilverAnt Titanium Water Bottle Wide Mouth Screw TopLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 65 mm across
- Leakproof
- BPA-free
Worth knowing
- Not dishwasher safe
- Single wall: not insulated
- Sold by one retailer we track (SilverAnt store)
Image not availableColor not published
The SilverAnt Round Titanium Water Bottle is a 500 mL–800 mL (17–27 fl oz) titanium water bottle that weighs 129 g and is 68 mm across. Its body is titanium and it ships with a screw cap.
It's the 6th lightest of the 15 bottles here. Worth knowing: not dishwasher safe.
- Capacity
- 500 mL–800 mL (17–27 fl oz)
- Weight
- 0.3 lb · 129 g
- Material
- Titanium
- Diameter
- 68 mm (2.7 in)
- Lid
- Screw cap
$64.99at SilverAnt store
Check price for the SilverAnt Round Titanium Water Bottle at SilverAnt store (opens in new tab)Full specs and sources for the SilverAnt Round Titanium Water BottleLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 68 mm across
- Safe on a stove or fire
- Leakproof
- BPA-free
- Carry loop
Worth knowing
- Not dishwasher safe
- Single wall: not insulated
- Sold by one retailer we track (SilverAnt store)
Image not availableColors: Covert Black
The Grayl 16.9oz UltraPress® Ti Purifier is a 500 mL (17 fl oz) titanium water bottle that weighs 400 g, is 70 mm across and has a built-in filter. Its body is titanium.
It's the 13th lightest of the 15 bottles here and the most expensive here at $179.95. Worth knowing: sold by one retailer we track (Grayl store).
- Capacity
- 500 mL (17 fl oz)
- Weight
- 0.9 lb · 400 g
- Material
- Titanium
- Diameter
- 70 mm (2.8 in)
- Lid
- Not published
$179.95at Grayl store, Covert Black
Check price for the Grayl 16.9oz UltraPress® Ti Purifier at Grayl store (opens in new tab)Full specs and sources for the Grayl 16.9oz UltraPress® Ti PurifierLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- Safe on a stove or fire
- Built-in filter (150 L)
- BPA-free
- Carry loop
Worth knowing
- Sold by one retailer we track (Grayl store)
Image not availableColors: Pastel Green
The Nalgene 16oz Wide Mouth Bottle is a 473 mL (16 fl oz) tritan water bottle that weighs 89 g and is 70 mm across. Its body is tritan (copolyester) and it ships with a screw cap.
It's the third lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (Nalgene store).
- Capacity
- 473 mL (16 fl oz)
- Weight
- 0.2 lb · 89 g
- Material
- Tritan (copolyester)
- Diameter
- 70 mm (2.8 in)
- Lid
- Screw cap
$14.99at Nalgene store
Check price for the Nalgene 16oz Wide Mouth Bottle at Nalgene store (opens in new tab)Full specs and sources for the Nalgene 16oz Wide Mouth BottleLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- Leakproof
- Dishwasher safe
- BPA-free
Worth knowing
- Sold by one retailer we track (Nalgene store)
Image not availableColors: white
The Nalgene 16oz Wide Mouth Ultralite Bottle is a 473 mL (16 fl oz) polyethylene water bottle that weighs 57 g and is 70 mm across. Its body is polyethylene (hdpe/ldpe) and it ships with a screw cap.
It's the second lightest of the 15 bottles here and the least expensive here at $5.50. Worth knowing: sold by one retailer we track (Nalgene store).
- Capacity
- 473 mL (16 fl oz)
- Weight
- 0.1 lb · 57 g
- Material
- Polyethylene (HDPE/LDPE)
- Diameter
- 70 mm (2.8 in)
- Lid
- Screw cap
$5.50at Nalgene store, white
Check price for the Nalgene 16oz Wide Mouth Ultralite Bottle at Nalgene store (opens in new tab)Full specs and sources for the Nalgene 16oz Wide Mouth Ultralite BottleLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- Leakproof
- Dishwasher safe
- BPA-free
Worth knowing
- Sold by one retailer we track (Nalgene store)
Image not availableColor not published
The SilverAnt Titanium Water Bottle Narrow Mouth Design is a 400 mL–600 mL (14–20 fl oz) titanium water bottle that weighs 113 g and is 70 mm across. Its body is titanium and it ships with a screw cap.
It's the fifth lightest of the 15 bottles here. Worth knowing: not dishwasher safe.
- Capacity
- 400 mL–600 mL (14–20 fl oz)
- Weight
- 0.2 lb · 113 g
- Material
- Titanium
- Diameter
- 70 mm (2.8 in)
- Lid
- Screw cap
$44.99at SilverAnt store
Check price for the SilverAnt Titanium Water Bottle Narrow Mouth Design at SilverAnt store (opens in new tab)Full specs and sources for the SilverAnt Titanium Water Bottle Narrow Mouth DesignLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- Safe on a stove or fire
- Leakproof
Worth knowing
- Not dishwasher safe
- Single wall: not insulated
- Sold by one retailer we track (SilverAnt store)
Image not availableColor not published
The Vargo Outdoors Stainless Insulated 650 ML Para-Bottle is a 650 mL (22 fl oz) insulated stainless steel water bottle that weighs 332 g and is 70 mm across. Its body is stainless steel and the brand says it keeps drinks cold for 24 hours and hot for 12 hours.
It's the 10th lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (Vargo Outdoors store).
- Capacity
- 650 mL (22 fl oz)
- Weight
- 0.7 lb · 332 g
- Material
- Stainless steel
- Diameter
- 70 mm (2.8 in)
- Lid
- Not published
$19.95at Vargo Outdoors store
Check price for the Vargo Outdoors Stainless Insulated 650 ML Para-Bottle at Vargo Outdoors store (opens in new tab)Full specs and sources for the Vargo Outdoors Stainless Insulated 650 ML Para-BottleLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- Vacuum insulated (24 h cold)
- Fits squeeze filters
- BPA-free
- Carry loop
Worth knowing
- Sold by one retailer we track (Vargo Outdoors store)
Image not availableColor not published
The Vargo Outdoors Titanium Water Bottle With TI LID is a 650 mL (22 fl oz) titanium water bottle that weighs 111 g and is 70 mm across. Its body is titanium and it ships with a screw cap.
It's the fourth lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (Vargo Outdoors store).
- Capacity
- 650 mL (22 fl oz)
- Weight
- 0.2 lb · 111 g
- Material
- Titanium
- Diameter
- 70 mm (2.8 in)
- Lid
- Screw cap
$84.95at Vargo Outdoors store
Check price for the Vargo Outdoors Titanium Water Bottle With TI LID at Vargo Outdoors store (opens in new tab)Full specs and sources for the Vargo Outdoors Titanium Water Bottle With TI LIDLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- Carry loop
Worth knowing
- Sold by one retailer we track (Vargo Outdoors store)
Image not availableThe Vargo Outdoors Titanium Water Bottle is a 650 mL (22 fl oz) titanium water bottle that weighs 130 g and is 70 mm across. Its body is titanium and it ships with a screw cap.
It's the 7th lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (Vargo Outdoors store).
- Capacity
- 650 mL (22 fl oz)
- Weight
- 0.3 lb · 130 g
- Material
- Titanium
- Diameter
- 70 mm (2.8 in)
- Lid
- Screw cap
$69.95at Vargo Outdoors store, Black
Check price for the Vargo Outdoors Titanium Water Bottle at Vargo Outdoors store (opens in new tab)Full specs and sources for the Vargo Outdoors Titanium Water BottleLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 70 mm across
- BPA-free
- Carry loop
Worth knowing
- Sold by one retailer we track (Vargo Outdoors store)
Image not availableThe LifeStraw Go Series 22 oz is a 650 mL (22 fl oz) water bottle that weighs 247 g, is 71 mm across and has a built-in filter.
It's the 9th lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (LifeStraw store).
- Capacity
- 650 mL (22 fl oz)
- Weight
- 0.5 lb · 247 g
- Material
- Not published
- Diameter
- 71 mm (2.8 in)
- Lid
- Not published
$35.96was $44.95at LifeStraw store, Icelandic Blue
Lowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 71 mm across
- Built-in filter (4,000 L)
- Leakproof
- Dishwasher safe
- BPA-free
Worth knowing
- Sold by one retailer we track (LifeStraw store)
Image not availableThe LifeStraw Go Series Stainless Steel 18 oz is a 530 mL (18 fl oz) insulated stainless steel water bottle that weighs 450 g, is 71 mm across and has a built-in filter. Its body is stainless steel and its opening is 60 mm.
At 1.0 lb it's the heaviest of the 15 bottles here. Worth knowing: heaviest bottle in this list.
- Capacity
- 530 mL (18 fl oz)
- Weight
- 1.0 lb · 450 g
- Material
- Stainless steel
- Diameter
- 71 mm (2.8 in)
- Lid
- Not published
$39.96was $49.95at LifeStraw store, Kyoto Orange
Lowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 71 mm across
- Vacuum insulated
- Built-in filter (4,000 L)
- Leakproof
- Dishwasher safe
Worth knowing
- Heaviest bottle in this list
- Sold by one retailer we track (LifeStraw store)
Klean Kanteen 12oz Classic with Loop Cap
Longest cold
Image not availableColors: Brushed
The Klean Kanteen 12oz Classic with Loop Cap is a 355 mL (12 fl oz) insulated stainless steel water bottle that weighs 349 g and is 73 mm across. Its body is stainless steel, it ships with a screw cap, its opening is 44 mm and the brand says it keeps drinks cold for 63 hours and hot for 24 hours.
It's the 11th lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (Klean Kanteen store).
- Capacity
- 355 mL (12 fl oz)
- Weight
- 0.8 lb · 349 g
- Material
- Stainless steel
- Diameter
- 73 mm (2.9 in)
- Lid
- Screw cap
$24.95was $34.95at Klean Kanteen store, Brushed
Lowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 73 mm across
- Vacuum insulated (63 h cold)
- Leakproof
- Dishwasher safe
- BPA-free
Worth knowing
- Sold by one retailer we track (Klean Kanteen store)
CNOC Outdoors ThruBottle
Lightest
Image not availableColor not published
The CNOC Outdoors ThruBottle is a 700 mL–1 L (24–34 fl oz) polyethylene water bottle that weighs 53 g and is 74 mm across. Its body is polyethylene (hdpe/ldpe), it ships with a screw cap and its opening is 28 mm.
It's the lightest of the 15 bottles here, 397 g lighter than the heaviest. Worth knowing: sold by one retailer we track (CNOC Outdoors store).
- Capacity
- 700 mL–1 L (24–34 fl oz)
- Weight
- 0.1 lb · 53 g
- Material
- Polyethylene (HDPE/LDPE)
- Diameter
- 74 mm (2.9 in)
- Lid
- Screw cap
$13.99at CNOC Outdoors store
Check price for the CNOC Outdoors ThruBottle at CNOC Outdoors store (opens in new tab)Full specs and sources for the CNOC Outdoors ThruBottleLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 74 mm across
- Fits squeeze filters
- BPA-free
Worth knowing
- Sold by one retailer we track (CNOC Outdoors store)
Image not availableThe Grayl 16.9oz UltraPress® Purifier is a 500 mL (17 fl oz) polypropylene water bottle that weighs 354 g, is 75 mm across and has a built-in filter. Its body is polypropylene.
It's the 12th lightest of the 15 bottles here. Worth knowing: sold by one retailer we track (Grayl store).
- Capacity
- 500 mL (17 fl oz)
- Weight
- 0.8 lb · 354 g
- Material
- Polypropylene
- Diameter
- 75 mm (3 in)
- Lid
- Not published
$89.95at Grayl store, Mojave Redrock
Check price for the Grayl 16.9oz UltraPress® Purifier at Grayl store (opens in new tab)Full specs and sources for the Grayl 16.9oz UltraPress® PurifierLowest in-stock price as of Oct 25, 2026.
Stands out
- Slim: 75 mm across
- Built-in filter (150 L)
- BPA-free
- Carry loop
Worth knowing
- Sold by one retailer we track (Grayl store)
Questions, answered from the data
What are the lightest slim water bottles for backpack side pockets?
The CNOC Outdoors ThruBottle is the lightest at 0.1 lb (53 g), by manufacturer spec.
What's the cheapest option?
The Nalgene 16oz Wide Mouth Ultralite Bottle, with a lowest in-stock price of $5.50 this week.
Which fit a backpack side pocket?
The SilverAnt Titanium Double-Wall Insulated Thermos Flask 400ml/14fl oz (65 mm), the SilverAnt Titanium Water Bottle Wide Mouth Screw Top (65 mm), the SilverAnt Round Titanium Water Bottle (68 mm), the Grayl 16.9oz UltraPress® Ti Purifier (70 mm), the Nalgene 16oz Wide Mouth Bottle (70 mm), the Nalgene 16oz Wide Mouth Ultralite Bottle (70 mm), the SilverAnt Titanium Water Bottle Narrow Mouth Design (70 mm), the Vargo Outdoors Stainless Insulated 650 ML Para-Bottle (70 mm), the Vargo Outdoors Titanium Water Bottle With TI LID (70 mm), the Vargo Outdoors Titanium Water Bottle (70 mm), the LifeStraw Go Series 22 oz (71 mm), the LifeStraw Go Series Stainless Steel 18 oz (71 mm), the Klean Kanteen 12oz Classic with Loop Cap (73 mm), the CNOC Outdoors ThruBottle (74 mm) and the Grayl 16.9oz UltraPress® Purifier (75 mm) are 75 mm across or slimmer, by the brand's figures, about the width of a 1 L smartwater bottle. Pocket sizes vary, so check yours.
Which can I heat on a stove?
The SilverAnt Round Titanium Water Bottle, the Grayl 16.9oz UltraPress® Ti Purifier and the SilverAnt Titanium Water Bottle Narrow Mouth Design are stove or fire safe, per the brand. Take the lid off first.
How we chose
This list includes every bottle in our database that meets all of these criteria: diameter 75 mm or less. Bottles are sorted by manufacturer weight, lightest first. Nobody pays to be included.
Specs come from manufacturer pages (or, for brands whose own sites we can’t read, a retailer’s page) unless marked otherwise, and every value links to its source on the product page. Prices are the lowest in-stock price we found on Oct 25, 2026 and change often.
This is a spec comparison, not a hands-on review. Summaries are written with AI assistance from verified data only. Read our methodology.