Sawyer SP110 Inline Hydration Pack Adapter Review

Overview

The SP110 isn’t a filter — it’s two small threaded fittings that let you splice a Sawyer Squeeze (or Micro Squeeze, Mini, or All-in-One) directly into your hydration bladder’s drink tube. Instead of filtering water into a bottle or pouch and drinking from that, you fill your reservoir with dirty water straight from the source and the filter cleans it on the way to your mouth. It’s aimed at hikers and bikepackers who want hands-free filtration without babysitting a squeeze bag at every water stop.

Key Specs

Spec	Value
Weight	9.0 g (0.3 oz)
Dimensions	10.2 x 4.4 x 10.2 cm
Materials	Plastic, stainless steel, silicone
Tubing compatibility	1/4” inner diameter (industry standard)
Compatible filters	Sawyer Squeeze, Dual Threaded MINI, All-in-One
Not compatible with	Sawyer Micro Squeeze (older SP2129) — thread redesign
Price	~$10-12

Performance

This is about as low-tech as gear gets — two plastic barbs with threaded ends — so there’s not much to “perform” beyond fitting properly and not leaking. On that front it does what it says: this set of inline adapters turns your Sawyer screw-on/off filter into an inline filtration system for your hydration pack by screwing the connections onto each side of the filter and inserting it into your hydration pack drink tube. Sawyer’s own instructions are worth following closely — insert the filter inline into your hydration pack tubing, and make sure the flow arrow is pointing toward the bite valve, otherwise you’ll be sipping unfiltered water and wondering why your Squeeze isn’t doing its job.

The real-world tradeoff people report is flow rate. Pushing water through a Squeeze via suction (drinking through a bite valve) is a lot less efficient than squeezing a pouch by hand, and hollow-fiber filters are flow-rate sensitive by nature. One DIY gravity-system writeup on Hammock Forums found putting a length of hydration tubing between the dirty bag and the filter greatly improved the flow rate of the system, likely by putting more water pressure on the filter — which tells you the inline sipping setup (short runs, suction-only pressure) is working against the filter’s natural strengths, not with them. In practice, expect noticeably slower sips than you’d get gravity-feeding or squeezing the same filter, especially as the membrane starts to load up with sediment.

The bigger practical snag isn’t performance, it’s compatibility churn. Sawyer has changed the SP110’s thread design at least once, and it’s caused real headaches: a UK retailer’s review thread noted a design change makes the adapter incompatible with the Micro Squeeze, and Sawyer confirmed the SP110 design had slightly changed, making it no longer compatible with the SP2129. If you own an older Micro Squeeze, don’t assume a fresh SP110 two-pack will thread on — check the current-gen compatibility list before buying, and if in doubt, buy from a retailer with easy returns.

Installation itself is a bit of minor surgery on gear you probably like: you’re cutting your hydration bladder’s tube in half to splice this in. Sawyer recommends cutting the tubing where you’d like the filter inserted, and placing it closer to the reservoir rather than near the bite valve — that keeps more of the “dirty” tubing on the reservoir side and less exposed downstream, which matters for the next point.

One thing worth flagging that doesn’t get discussed enough: once you’ve run untreated water through your bladder and tube, that reservoir is now a “dirty” one. When you don’t need to filter water, you can unscrew the connections and screw them together to reconnect the tube, but you need to thoroughly clean a dirty reservoir before drinking from it without your Sawyer filter. That’s a real behavior change for anyone used to just filling a bladder at a tap and drinking normally — you either commit to always filtering, or you commit to decontaminating the reservoir between “raw” and “treated” use, which is more hassle than most people expect going in.

On the plus side, at 9 grams and about $10, this is one of the cheapest ways to build an always-on filtered hydration setup, and it doesn’t require buying a whole new bladder system — any 1/4” ID hydration tube works.

Pros & Cons

Pros

• Genuinely tiny and cheap — 9 g and roughly $10-12 for the pair of fittings
• Works with tubing you likely already own (1/4” ID is the near-universal standard)
• Turns a Squeeze you’re already carrying for water-source filtering into a passive, always-filtered hydration system
• Reversible — screw the two halves together to bypass the filter when you don’t need it
• Compatible with the current Squeeze, MINI, and All-in-One lineup

Cons

• Sipping through a straw-like setup is far less efficient at pushing water through a hollow-fiber membrane than squeezing or gravity-feeding, so expect slower flow, especially as the filter loads up
• Thread redesign has broken compatibility with older Micro Squeeze units — verify fit before buying if you own an older filter
• Once your bladder has held raw water, it’s a “dirty” reservoir that needs real cleaning before you can safely drink from it unfiltered
• Cutting your hydration tube is a one-way commitment — not something you want to do to a brand-new premium reservoir on a whim
• No meaningful backflushing in this configuration; you’ll likely need to pull the filter to clean it on-trail if flow drops off

Who Should Buy This

This adapter is for hikers who already run a Sawyer Squeeze and a hydration bladder and want to stop stopping to filter at every water source — think fastpackers, mountain bikers, or thru-hikers who value continuous movement over squeeze-bag ritual. It’s not a great fit if you’re precious about your current reservoir’s tubing, if you own an older Micro Squeeze without confirming current-gen thread compatibility, or if you want maximum flow rate and don’t mind the extra step of squeezing a pouch instead of sipping through a straw.

Verdict

The SP110 does exactly one simple job — splice a Squeeze into your hydration tube — and does it for next to nothing in weight or cost. The catches are the flow-rate penalty of sip-only filtration, a thread compatibility issue with older Sawyer filters, and the fact that you’re committing your reservoir to “always treat as dirty” status. Worth the $10 if you understand those tradeoffs going in; skip it if you already like your current filtering routine or you’re not ready to dedicate a bladder to raw water duty. I’d call it a 7/10 — a smart, cheap accessory with a couple of asterisks that Sawyer doesn’t put on the packaging.