MSR · Updated August 2026
MSR Guardian Water Purifier: price & specs
MSR Guardian Water Purifier. Every price and spec below is linked to its source and dated — no guesses.
Source: cascadedesigns.com verified verify in ledger
The MSR Guardian Water Purifier is listed at $350.87 on cascadedesigns.com as of 2026-08-16, the most expensive backpacking water filters (median $45); other retailers may be lower. It earns a Bronze Deskmark — 0/100 pay-blind standing, #13 of 13 in class.
Verified Aug 16, 2026 · figures linked to their source in the table below
Cheapest backpacking water filters: HydroBlu Versa Flow Water Filter — $25.95
Price history
$350.87Dropped from the price on record when we began tracking (2026-08-16). A dated chart builds here as the price moves over the coming days.
Is the MSR Guardian Water Purifier a good buy?
At $351, the MSR Guardian Water Purifier is the most expensive of the 14 backpacking water filters we track, where the median is $45. On the spec sheet, its filtration rating microns of 0.02 is the lowest of the 11, its weight of 17 oz is the highest of the 13, and its flow rate lpm of 2.5 is above the median of the 9.
Specifications
| Price (US) | $350.87 — current on record (was $399.95) |
|---|---|
| Brand | MSR |
| Released | — |
| Filtration rating microns | 0.02 |
| Flow rate lpm | 2.5 |
| Rated lifetime (L) | 10000 |
| Filter media type | advanced hollow-fiber membrane |
| Removes bacteria protozoa virus | bacteria, protozoa, and virus (EPA-compliant purifier) |
| Weight (oz) | 17 |
| Field cleanable backflush | Yes |
| Cartridge replaceable | No |
Source: cascadedesigns.com (verified 2026-08-11). Cascade Designs' own MSR Guardian product page confirms 0.02 micron advanced hollow-fiber membrane, 2.5 L/min flow, 10,000+ L rated lifetime, self-cleaning backflush on every pump stroke, 1 lb 1 oz (490 g) weight, EPA-standard removal of bacteria, protozoa, and viruses, and a $399.95 list price. The page describes a "Cartridge Replacement Indicator" but MSR's Guardian cartridge is a sealed, non-user-swappable unit designed to be serviced/replaced through MSR rather than field-exchanged, so cartridge_replaceable is recorded as false to distinguish it from cartridge-swap designs like the Hiker Pro or Vario.
Is the MSR Guardian Water Purifier worth it vs cheaper backpacking water filters?
MSR Guardian Water Purifier against its closest cheaper and pricier backpacking water filters on the specs that matter — every value sourced. See all 14 ranked
| Product | Price | Filtration rating microns | Flow rate lpm | Rated lifetime (L) | Filter media type | Removes bacteria protozoa virus |
|---|---|---|---|---|---|---|
| MSR Guardian Water Purifier this | $350.87 | 0.02 | 2.5 | 10000 | advanced hollow-fiber membrane | bacteria, protozoa, and virus (EPA-compliant purifier) |
| GRAYL GeoPress 24oz Water Purifier | $99.95 | — | 5.3 | 250 | electroadsorption + ultra-powdered activated carbon (purifier cartridge) | bacteria, protozoa, and virus (EPA-compliant purifier) |
Frequently asked questions
How much does the MSR Guardian Water Purifier cost?
The MSR Guardian Water Purifier has a US price of $350.87, as of 2026-08-16.
How does the MSR Guardian Water Purifier compare on price?
At $351, the MSR Guardian Water Purifier is the most expensive of the 14 backpacking water filters we track, where the median is $45.
Has the MSR Guardian Water Purifier's price changed?
No — the MSR Guardian Water Purifier has held at $350.87 since 2026-08-16.
What is the lowest price the MSR Guardian Water Purifier has been?
The lowest we have recorded for the MSR Guardian Water Purifier is $350.87 on 2026-08-16.
Is now a good time to buy the MSR Guardian Water Purifier?
The MSR Guardian Water Purifier is currently $350.87; the lowest we have recorded is $350.87 (2026-08-16). Every price is dated, so you can judge it against its own history.
What are the MSR Guardian Water Purifier's key specs?
MSR Guardian Water Purifier (MSR): filtration rating microns 0.02, flow rate lpm 2.5, rated lifetime l 10000, filter media type advanced hollow-fiber membrane, removes bacteria protozoa virus bacteria, protozoa, and virus (EPA-compliant purifier). Full sourced spec sheet verified 2026-08-11.
Price of record: $350.87 at cascadedesigns.com, 2026-08-16. Other retailers may be lower — check the current price:
See MSR Guardian Water Purifier on Amazon As an Amazon Associate we earn from qualifying purchases.Similar backpacking water filters
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All backpacking water filters ranked · Open data & methodology · Queryable via MCP
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Head-to-head
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